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12 vulnerabilities found for etherpad by ether
CVE-2026-55090 (GCVE-0-2026-55090)
Vulnerability from nvd – Published: 2026-08-19 19:32 – Updated: 2026-08-20 12:39
VLAI
EPSS
VEX
Title
Etherpad: Stored XSS in HTML export via unescaped attribute-pool values
Summary
Etherpad is a real-time collaborative editor. Prior to 3.3.0, getHTMLFromAtext in src/node/utils/ExportHtml.ts interpolates values from the exportHtmlAdditionalTagsWithData plugin hook into span data attributes without HTML attribute escaping. A pad editor can place an attacker-controlled value into the attribute pool through moveOpsToNewPool and AttributePool.putAttrib. When a bundled plugin such as ep_font_color or ep_font_size registers the hook, opening the resulting HTML export causes the value to execute as stored cross-site scripting in the Etherpad origin. This issue is fixed in version 3.3.0.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 12:37 UTC
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ether/etherpad/security/adviso… | x_refsource_CONFIRM |
| https://github.com/ether/etherpad/pull/7905 | x_refsource_MISC |
| https://github.com/ether/etherpad/commit/86c56cf8… | x_refsource_MISC |
| https://github.com/ether/etherpad/releases/tag/v3.3.0 | x_refsource_MISC |
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CVE-2026-55089 (GCVE-0-2026-55089)
Vulnerability from nvd – Published: 2026-08-19 19:33 – Updated: 2026-08-19 19:48
VLAI
EPSS
VEX
Title
Etherpad: JWT `admin` claim presence-only check lets non-admin OAuth users invoke every Etherpad HTTP API endpoint
Summary
Etherpad is a real-time collaborative editor. From 2.1.0 until 3.1.0, Etherpad's src/node/handler/APIHandler.ts authorizes requests to /api/2/* in the authorization_code OAuth path by using requiredClaims with the admin claim. This check requires only that the claim exists, while src/node/security/OAuth2Provider.ts issues admin: false for configured non-admin users. A non-admin user with a valid signed token can therefore invoke administrative functions including setHTML, setText, appendText, deletePad, copyPad, movePad, restoreRevision, anonymizeAuthor, listAllPads, and listAuthorsOfPad, allowing disclosure, modification, or deletion of pads across the instance. This issue is fixed in version 3.1.0.
Severity
9.9 (Critical)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-19 19:48 UTC
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ether/etherpad/security/adviso… | x_refsource_CONFIRM |
| https://github.com/ether/etherpad/pull/7784 | x_refsource_MISC |
| https://github.com/ether/etherpad/commit/8c6104c5… | x_refsource_MISC |
| https://github.com/ether/etherpad/releases/tag/v3.1.0 | x_refsource_MISC |
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CVE-2026-55088 (GCVE-0-2026-55088)
Vulnerability from nvd – Published: 2026-08-19 19:30 – Updated: 2026-08-21 21:48
VLAI
EPSS
VEX
Title
Etherpad: Device-to-device author-token transfer endpoint is replayable, never expires, and exposes the cleartext author token
Summary
Etherpad is a real-time collaborative editor. From 2.6.0 until 3.1.0, Etherpad's src/node/hooks/express/tokenTransfer.ts uses POST /tokenTransfer to store an author token for transfer between browsers and exposes it through GET /tokenTransfer/{uuid}. Although the record includes createdAt, the transfer has no expiration check, is not removed after successful redemption, and is returned by res.send(tokenData), including the raw author token. An unauthenticated attacker who obtains a transfer UUID can repeatedly redeem it, receive fresh author cookies, read the cleartext token, and impersonate the originating author for pad read and write operations. This issue is fixed in version 3.1.0.
Severity
6.8 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-21 21:00 UTC
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ether/etherpad/security/adviso… | x_refsource_CONFIRM |
| https://github.com/ether/etherpad/pull/7784 | x_refsource_MISC |
| https://github.com/ether/etherpad/commit/8c6104c5… | x_refsource_MISC |
| https://github.com/ether/etherpad/tree/3.1.0 | x_refsource_MISC |
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CVE-2026-55087 (GCVE-0-2026-55087)
Vulnerability from nvd – Published: 2026-08-19 19:29 – Updated: 2026-08-21 21:48
VLAI
EPSS
VEX
Title
Etherpad: x-proxy-path header reflected into admin HTML/JS/CSS (cache-poisoning XSS) and concatenated into redirect (open-redirect)
Summary
Etherpad is a real-time collaborative editor. From 2.1.0 until 3.1.0, Etherpad uses the attacker-controlled x-proxy-path request header in src/node/hooks/express/admin.ts when substituting paths into HTML, JavaScript, and CSS under /admin without sanitization, Vary: x-proxy-path, or Cache-Control: private, no-store. A shared proxy or CDN can cache the resulting response and serve attacker-injected script to an administrator. In src/node/hooks/express/specialpages.ts, version 3.0.0 also accepts a protocol-relative x-proxy-path value when constructing the /p/:pad/timeslider redirect, allowing redirection to an attacker-controlled host. The issues are exploitable when the deployment permits client-supplied x-proxy-path headers to reach Etherpad. This issue is fixed in version 3.1.0.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-21 20:58 UTC
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ether/etherpad/security/adviso… | x_refsource_CONFIRM |
| https://github.com/ether/etherpad/pull/7784 | x_refsource_MISC |
| https://github.com/ether/etherpad/commit/8c6104c5… | x_refsource_MISC |
| https://github.com/ether/etherpad/tree/3.1.0 | x_refsource_MISC |
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},
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}
],
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},
"title": "Etherpad: x-proxy-path header reflected into admin HTML/JS/CSS (cache-poisoning XSS) and concatenated into redirect (open-redirect)"
}
},
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CVE-2026-55086 (GCVE-0-2026-55086)
Vulnerability from nvd – Published: 2026-08-19 19:35 – Updated: 2026-08-19 19:35
VLAI
EPSS
VEX
Title
Etherpad: Import/export use Math.random() for temp file paths; predictable paths on shared /tmp enable symlink-based file overwrite
Summary
Etherpad is a real-time collaborative editor. Prior to 3.1.0, src/node/handler/ImportHandler.ts and src/node/handler/ExportHandler.ts derive temporary filenames from Math.random() and place them in os.tmpdir(). On a host with a shared world-writable temporary directory, a local unprivileged attacker who predicts a filename can precreate a symbolic link to a file writable by the Etherpad process. Subsequent import or export operations can follow the link through fs.writeFile, fs.rename, or document-conversion output and overwrite the target with partially attacker-controlled content. This issue is fixed in version 3.1.0.
Severity
4.2 (Medium)
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ether/etherpad/security/adviso… | x_refsource_CONFIRM |
| https://github.com/ether/etherpad/pull/7784 | x_refsource_MISC |
| https://github.com/ether/etherpad/commit/8c6104c5… | x_refsource_MISC |
| https://github.com/ether/etherpad/releases/tag/v3.1.0 | x_refsource_MISC |
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CVE-2026-55085 (GCVE-0-2026-55085)
Vulnerability from nvd – Published: 2026-08-19 19:34 – Updated: 2026-08-21 19:47
VLAI
EPSS
VEX
Title
Etherpad: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in etherpad-lite
Summary
Etherpad is a real-time collaborative editor. Prior to 3.3.1, result.appendSpan in src/static/js/domline.ts interpolates the start attribute of a numbered list directly into an unquoted ol start attribute before assigning the generated markup to node.innerHTML. ImportEtherpad.setPadRaw in src/node/utils/ImportEtherpad.ts accepts attacker-controlled attribute-pool values from a crafted .etherpad import, including list:number1 and a malicious start value. Any user with write access to a pad can store markup that executes as cross-site scripting when another user opens the pad or /timeslider, including when an administrator views the pad. This issue is fixed in version 3.3.1.
Severity
9.6 (Critical)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-21 19:46 UTC
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ether/etherpad/security/adviso… | x_refsource_CONFIRM |
| https://github.com/ether/etherpad/pull/7937 | x_refsource_MISC |
| https://github.com/ether/etherpad/commit/d828185e… | x_refsource_MISC |
| https://github.com/ether/etherpad/releases/tag/v3.3.1 | x_refsource_MISC |
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CVE-2026-55086 (GCVE-0-2026-55086)
Vulnerability from cvelistv5 – Published: 2026-08-19 19:35 – Updated: 2026-08-19 19:35
VLAI
EPSS
VEX
Title
Etherpad: Import/export use Math.random() for temp file paths; predictable paths on shared /tmp enable symlink-based file overwrite
Summary
Etherpad is a real-time collaborative editor. Prior to 3.1.0, src/node/handler/ImportHandler.ts and src/node/handler/ExportHandler.ts derive temporary filenames from Math.random() and place them in os.tmpdir(). On a host with a shared world-writable temporary directory, a local unprivileged attacker who predicts a filename can precreate a symbolic link to a file writable by the Etherpad process. Subsequent import or export operations can follow the link through fs.writeFile, fs.rename, or document-conversion output and overwrite the target with partially attacker-controlled content. This issue is fixed in version 3.1.0.
Severity
4.2 (Medium)
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ether/etherpad/security/adviso… | x_refsource_CONFIRM |
| https://github.com/ether/etherpad/pull/7784 | x_refsource_MISC |
| https://github.com/ether/etherpad/commit/8c6104c5… | x_refsource_MISC |
| https://github.com/ether/etherpad/releases/tag/v3.1.0 | x_refsource_MISC |
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"product": "etherpad",
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CVE-2026-55085 (GCVE-0-2026-55085)
Vulnerability from cvelistv5 – Published: 2026-08-19 19:34 – Updated: 2026-08-21 19:47
VLAI
EPSS
VEX
Title
Etherpad: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in etherpad-lite
Summary
Etherpad is a real-time collaborative editor. Prior to 3.3.1, result.appendSpan in src/static/js/domline.ts interpolates the start attribute of a numbered list directly into an unquoted ol start attribute before assigning the generated markup to node.innerHTML. ImportEtherpad.setPadRaw in src/node/utils/ImportEtherpad.ts accepts attacker-controlled attribute-pool values from a crafted .etherpad import, including list:number1 and a malicious start value. Any user with write access to a pad can store markup that executes as cross-site scripting when another user opens the pad or /timeslider, including when an administrator views the pad. This issue is fixed in version 3.3.1.
Severity
9.6 (Critical)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-21 19:46 UTC
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ether/etherpad/security/adviso… | x_refsource_CONFIRM |
| https://github.com/ether/etherpad/pull/7937 | x_refsource_MISC |
| https://github.com/ether/etherpad/commit/d828185e… | x_refsource_MISC |
| https://github.com/ether/etherpad/releases/tag/v3.3.1 | x_refsource_MISC |
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CVE-2026-55089 (GCVE-0-2026-55089)
Vulnerability from cvelistv5 – Published: 2026-08-19 19:33 – Updated: 2026-08-19 19:48
VLAI
EPSS
VEX
Title
Etherpad: JWT `admin` claim presence-only check lets non-admin OAuth users invoke every Etherpad HTTP API endpoint
Summary
Etherpad is a real-time collaborative editor. From 2.1.0 until 3.1.0, Etherpad's src/node/handler/APIHandler.ts authorizes requests to /api/2/* in the authorization_code OAuth path by using requiredClaims with the admin claim. This check requires only that the claim exists, while src/node/security/OAuth2Provider.ts issues admin: false for configured non-admin users. A non-admin user with a valid signed token can therefore invoke administrative functions including setHTML, setText, appendText, deletePad, copyPad, movePad, restoreRevision, anonymizeAuthor, listAllPads, and listAuthorsOfPad, allowing disclosure, modification, or deletion of pads across the instance. This issue is fixed in version 3.1.0.
Severity
9.9 (Critical)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-19 19:48 UTC
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ether/etherpad/security/adviso… | x_refsource_CONFIRM |
| https://github.com/ether/etherpad/pull/7784 | x_refsource_MISC |
| https://github.com/ether/etherpad/commit/8c6104c5… | x_refsource_MISC |
| https://github.com/ether/etherpad/releases/tag/v3.1.0 | x_refsource_MISC |
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CVE-2026-55090 (GCVE-0-2026-55090)
Vulnerability from cvelistv5 – Published: 2026-08-19 19:32 – Updated: 2026-08-20 12:39
VLAI
EPSS
VEX
Title
Etherpad: Stored XSS in HTML export via unescaped attribute-pool values
Summary
Etherpad is a real-time collaborative editor. Prior to 3.3.0, getHTMLFromAtext in src/node/utils/ExportHtml.ts interpolates values from the exportHtmlAdditionalTagsWithData plugin hook into span data attributes without HTML attribute escaping. A pad editor can place an attacker-controlled value into the attribute pool through moveOpsToNewPool and AttributePool.putAttrib. When a bundled plugin such as ep_font_color or ep_font_size registers the hook, opening the resulting HTML export causes the value to execute as stored cross-site scripting in the Etherpad origin. This issue is fixed in version 3.3.0.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 12:37 UTC
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ether/etherpad/security/adviso… | x_refsource_CONFIRM |
| https://github.com/ether/etherpad/pull/7905 | x_refsource_MISC |
| https://github.com/ether/etherpad/commit/86c56cf8… | x_refsource_MISC |
| https://github.com/ether/etherpad/releases/tag/v3.3.0 | x_refsource_MISC |
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CVE-2026-55088 (GCVE-0-2026-55088)
Vulnerability from cvelistv5 – Published: 2026-08-19 19:30 – Updated: 2026-08-21 21:48
VLAI
EPSS
VEX
Title
Etherpad: Device-to-device author-token transfer endpoint is replayable, never expires, and exposes the cleartext author token
Summary
Etherpad is a real-time collaborative editor. From 2.6.0 until 3.1.0, Etherpad's src/node/hooks/express/tokenTransfer.ts uses POST /tokenTransfer to store an author token for transfer between browsers and exposes it through GET /tokenTransfer/{uuid}. Although the record includes createdAt, the transfer has no expiration check, is not removed after successful redemption, and is returned by res.send(tokenData), including the raw author token. An unauthenticated attacker who obtains a transfer UUID can repeatedly redeem it, receive fresh author cookies, read the cleartext token, and impersonate the originating author for pad read and write operations. This issue is fixed in version 3.1.0.
Severity
6.8 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-21 21:00 UTC
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ether/etherpad/security/adviso… | x_refsource_CONFIRM |
| https://github.com/ether/etherpad/pull/7784 | x_refsource_MISC |
| https://github.com/ether/etherpad/commit/8c6104c5… | x_refsource_MISC |
| https://github.com/ether/etherpad/tree/3.1.0 | x_refsource_MISC |
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CVE-2026-55087 (GCVE-0-2026-55087)
Vulnerability from cvelistv5 – Published: 2026-08-19 19:29 – Updated: 2026-08-21 21:48
VLAI
EPSS
VEX
Title
Etherpad: x-proxy-path header reflected into admin HTML/JS/CSS (cache-poisoning XSS) and concatenated into redirect (open-redirect)
Summary
Etherpad is a real-time collaborative editor. From 2.1.0 until 3.1.0, Etherpad uses the attacker-controlled x-proxy-path request header in src/node/hooks/express/admin.ts when substituting paths into HTML, JavaScript, and CSS under /admin without sanitization, Vary: x-proxy-path, or Cache-Control: private, no-store. A shared proxy or CDN can cache the resulting response and serve attacker-injected script to an administrator. In src/node/hooks/express/specialpages.ts, version 3.0.0 also accepts a protocol-relative x-proxy-path value when constructing the /p/:pad/timeslider redirect, allowing redirection to an attacker-controlled host. The issues are exploitable when the deployment permits client-supplied x-proxy-path headers to reach Etherpad. This issue is fixed in version 3.1.0.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-21 20:58 UTC
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ether/etherpad/security/adviso… | x_refsource_CONFIRM |
| https://github.com/ether/etherpad/pull/7784 | x_refsource_MISC |
| https://github.com/ether/etherpad/commit/8c6104c5… | x_refsource_MISC |
| https://github.com/ether/etherpad/tree/3.1.0 | x_refsource_MISC |
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"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T19:29:16.221Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/ether/etherpad/security/advisories/GHSA-fjgc-3mj7-8rg8",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/ether/etherpad/security/advisories/GHSA-fjgc-3mj7-8rg8"
},
{
"name": "https://github.com/ether/etherpad/pull/7784",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/ether/etherpad/pull/7784"
},
{
"name": "https://github.com/ether/etherpad/commit/8c6104c5d5daf41f0d454acc04d42dffa0e0d996",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/ether/etherpad/commit/8c6104c5d5daf41f0d454acc04d42dffa0e0d996"
},
{
"name": "https://github.com/ether/etherpad/tree/3.1.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/ether/etherpad/tree/3.1.0"
}
],
"source": {
"advisory": "GHSA-fjgc-3mj7-8rg8",
"discovery": "UNKNOWN"
},
"title": "Etherpad: x-proxy-path header reflected into admin HTML/JS/CSS (cache-poisoning XSS) and concatenated into redirect (open-redirect)"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-55087",
"datePublished": "2026-08-19T19:29:16.221Z",
"dateReserved": "2026-06-16T14:41:54.578Z",
"dateUpdated": "2026-08-21T21:48:54.703Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}