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5 vulnerabilities found for Grav by Grav
CVE-2026-58657 (GCVE-0-2026-58657)
Vulnerability from cvelistv5 – Published: 2026-07-08 13:49 – Updated: 2026-07-08 14:21
VLAI
EPSS
VEX
Title
Grav - Stored CSS Injection via Markdown Image resize() Action
Summary
Grav before 2.0.0 (affected through 2.0.0-rc.9 and the 2.0 branch) contains a stored CSS injection vulnerability in the Markdown image resize() media action. Prior media hardening rejects direct ?style= payloads and unsafe attribute() fallbacks, but the resize() action in Excerpts::processMediaActions() writes caller-controlled values directly into the image's styleAttributes. A lower-privileged content editor who can edit page Markdown can store a crafted image URL with semicolon-delimited CSS declarations in the resize parameters, which are rendered into the final <img style=...> attribute when a higher-privileged reviewer/admin views the page or preview. This does not require JavaScript execution but enables UI redress/overlay and content-manipulation attacks (e.g., a full-viewport fixed overlay). Fixed in 2.0.0.
Severity
4.8 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/getgrav/grav/security/advisori… | vendor-advisory |
| https://github.com/getgrav/grav/commit/6582166173… | patch |
| https://github.com/getgrav/grav/commit/e03d29aa0d… | patch |
| https://www.vulncheck.com/advisories/grav-stored-… | third-party-advisory |
Impacted products
Date Public
2026-06-22 00:00
Credits
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CVE-2026-58654 (GCVE-0-2026-58654)
Vulnerability from cvelistv5 – Published: 2026-07-08 13:49 – Updated: 2026-07-08 17:05
VLAI
EPSS
VEX
Title
Grav - Arbitrary File Upload via Avatar Endpoint
Summary
The Grav API plugin (getgrav/grav-plugin-api) 1.0.0 contains an unrestricted file upload vulnerability in the avatar upload endpoint (/api/v1/users/user/avatar). The endpoint validates only the client-declared MIME type (getClientMediaType) beginning with 'image/' and does not inspect the actual file content or restrict the resulting extension, allowing an authenticated user to store arbitrary content — including PHP code, SVG with embedded JavaScript, and polyglot payloads — under user/accounts/avatars/ with predictable filenames. Direct HTTP access to the stored files is blocked by .htaccess (returns 403), but the files persist on disk and could lead to remote code execution or stored XSS in the presence of a path traversal flaw or server misconfiguration. Fixed in 1.0.1.
Severity
4.3 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/getgrav/grav/security/advisori… | vendor-advisory |
| https://www.vulncheck.com/advisories/grav-arbitra… | third-party-advisory |
Impacted products
Date Public
2026-06-22 00:00
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CVE-2026-56700 (GCVE-0-2026-56700)
Vulnerability from cvelistv5 – Published: 2026-06-30 22:08 – Updated: 2026-07-01 14:40
VLAI
EPSS
VEX
Title
Grav - Multiple Remote Code Execution Vulnerabilities via Unsafe Unserialize and Command Injection
Summary
Grav CMS before 2.0.0-beta.2 contains multiple code-execution vulnerabilities. Three unsafe unserialize() calls - in Scheduler\JobQueue, Framework\Cache\Adapter\FileCache, and Session - deserialize untrusted data without restricting allowed classes, enabling PHP object injection and, via a gadget chain, arbitrary code execution where an attacker controls the serialized input. Additionally, InstallCommand's git clone operation passes the branch, url, and path parameters into a shell command without escaping, allowing OS command injection via plugin/theme installation (which requires admin access). A Twig security blocklist bypass (server-side template injection) is also present. The issues are fixed in 2.0.0-beta.2.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/getgrav/grav/security/advisori… | vendor-advisory |
| https://www.vulncheck.com/advisories/grav-multipl… | third-party-advisory |
Impacted products
Date Public
2026-04-27 00:00
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CVE-2020-37256 (GCVE-0-2020-37256)
Vulnerability from cvelistv5 – Published: 2026-06-25 21:41 – Updated: 2026-06-27 02:27
VLAI
EPSS
VEX
Title
Grav - Cross-Site Scripting in Admin Plugin Page Editor
Summary
Grav before 1.6.30 contains a cross-site scripting vulnerability in the Admin plugin page editor default security configuration. Privileged users with page editing capabilities can inject malicious scripts to execute arbitrary code and install malicious plugins for system access.
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/getgrav/grav/security/advisori… | vendor-advisory |
| https://www.vulncheck.com/advisories/grav-cross-s… | third-party-advisory |
Impacted products
Date Public
2020-12-10 00:00
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CVE-2026-56701 (GCVE-0-2026-56701)
Vulnerability from cvelistv5 – Published: 2026-06-23 12:13 – Updated: 2026-06-23 14:42
VLAI
EPSS
VEX
Title
Grav - XML External Entity Injection via SVG Upload
Summary
Grav before 2.0.0-beta.2 contains an XML external entity injection vulnerability in SVG file upload processing that allows authenticated attackers to read arbitrary files. The application uses simplexml_load_string without disabling external entity loading, enabling attackers to inject XXE payloads via malicious SVG files to exfiltrate sensitive data.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-611 - Improper Restriction of XML External Entity Reference
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/getgrav/grav/security/advisori… | vendor-advisory |
| https://www.vulncheck.com/advisories/grav-xml-ext… | third-party-advisory |
Impacted products
Date Public
2026-04-27 00:00
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