CVE-2026-20888 (GCVE-0-2026-20888)
Vulnerability from cvelistv5 – Published: 2026-01-22 22:01 – Updated: 2026-01-23 21:54
VLAI
EPSS
VEX
Title
Gitea Pull Requests Auto-Merge: Read-Only Users Can Cancel Scheduled Auto-Merge via Web Endpoint (Authorization Bypass)
Summary
Gitea does not properly verify authorization when canceling scheduled auto-merges via the web interface. A user with read access to pull requests may be able to cancel auto-merges scheduled by other users.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-23 21:09 UTC
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/go-gitea/gitea/security/adviso… | vendor-advisory |
| https://github.com/go-gitea/gitea/pull/36341 | patch |
| https://github.com/go-gitea/gitea/pull/36356 | patch |
| https://github.com/go-gitea/gitea/releases/tag/v1.25.4 | release-notes |
| https://blog.gitea.com/release-of-1.25.4/ | release-notes |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Gitea | Gitea Open Source Git Server |
Affected:
0 , ≤ 1.25.3
(semver)
|
guessed |
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-20888",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-01-23T21:09:52.298236Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-01-23T21:54:14.856Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Gitea Open Source Git Server",
"vendor": "Gitea",
"versions": [
{
"lessThanOrEqual": "1.25.3",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "reporter",
"value": "spingARbor"
}
],
"descriptions": [
{
"lang": "en",
"value": "Gitea does not properly verify authorization when canceling scheduled auto-merges via the web interface. A user with read access to pull requests may be able to cancel auto-merges scheduled by other users."
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-284",
"description": "CWE-284: Improper Access Control",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "CWE-862: Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-01-22T22:01:51.214Z",
"orgId": "88ee5874-cf24-4952-aea0-31affedb7ff2",
"shortName": "Gitea"
},
"references": [
{
"name": "GitHub Security Advisory",
"tags": [
"vendor-advisory"
],
"url": "https://github.com/go-gitea/gitea/security/advisories/GHSA-ccq9-c5hv-cf64"
},
{
"name": "GitHub Pull Request #36341",
"tags": [
"patch"
],
"url": "https://github.com/go-gitea/gitea/pull/36341"
},
{
"name": "GitHub Pull Request #36356",
"tags": [
"patch"
],
"url": "https://github.com/go-gitea/gitea/pull/36356"
},
{
"name": "Gitea v1.25.4 Release",
"tags": [
"release-notes"
],
"url": "https://github.com/go-gitea/gitea/releases/tag/v1.25.4"
},
{
"name": "Gitea v1.25.4 Release Blog Post",
"tags": [
"release-notes"
],
"url": "https://blog.gitea.com/release-of-1.25.4/"
}
],
"title": "Gitea Pull Requests Auto-Merge: Read-Only Users Can Cancel Scheduled Auto-Merge via Web Endpoint (Authorization Bypass)"
}
},
"cveMetadata": {
"assignerOrgId": "88ee5874-cf24-4952-aea0-31affedb7ff2",
"assignerShortName": "Gitea",
"cveId": "CVE-2026-20888",
"datePublished": "2026-01-22T22:01:51.214Z",
"dateReserved": "2026-01-08T23:02:37.542Z",
"dateUpdated": "2026-01-23T21:54:14.856Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-20888",
"date": "2026-09-18",
"epss": "0.00315",
"percentile": "0.24673"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Gitea Open Source Git Server",
"vendor": "Gitea",
"versions": [
{
"lessThanOrEqual": "1.25.3",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"source": "88ee5874-cf24-4952-aea0-31affedb7ff2"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:gitea:gitea:*:*:*:*:*:-:*:*",
"matchCriteriaId": "DFCB7D74-331D-4582-AB41-113A25BE8FAA",
"versionEndExcluding": "1.25.4",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Gitea does not properly verify authorization when canceling scheduled auto-merges via the web interface. A user with read access to pull requests may be able to cancel auto-merges scheduled by other users."
},
{
"lang": "es",
"value": "Gitea no verifica correctamente la autorizaci\u00f3n al cancelar fusiones autom\u00e1ticas programadas a trav\u00e9s de la interfaz web. Un usuario con acceso de lectura a las solicitudes de extracci\u00f3n podr\u00eda cancelar fusiones autom\u00e1ticas programadas por otros usuarios."
}
],
"id": "CVE-2026-20888",
"lastModified": "2026-06-17T10:17:59.757",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 1.4,
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-20888",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-01-23T21:09:52.298236Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-01-22T22:16:17.890",
"references": [
{
"source": "88ee5874-cf24-4952-aea0-31affedb7ff2",
"tags": [
"Release Notes"
],
"url": "https://blog.gitea.com/release-of-1.25.4/"
},
{
"source": "88ee5874-cf24-4952-aea0-31affedb7ff2",
"tags": [
"Issue Tracking",
"Patch"
],
"url": "https://github.com/go-gitea/gitea/pull/36341"
},
{
"source": "88ee5874-cf24-4952-aea0-31affedb7ff2",
"tags": [
"Issue Tracking",
"Patch"
],
"url": "https://github.com/go-gitea/gitea/pull/36356"
},
{
"source": "88ee5874-cf24-4952-aea0-31affedb7ff2",
"tags": [
"Release Notes"
],
"url": "https://github.com/go-gitea/gitea/releases/tag/v1.25.4"
},
{
"source": "88ee5874-cf24-4952-aea0-31affedb7ff2",
"tags": [
"Broken Link"
],
"url": "https://github.com/go-gitea/gitea/security/advisories/GHSA-ccq9-c5hv-cf64"
}
],
"sourceIdentifier": "88ee5874-cf24-4952-aea0-31affedb7ff2",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-284"
},
{
"lang": "en",
"value": "CWE-862"
}
],
"source": "88ee5874-cf24-4952-aea0-31affedb7ff2",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-27T15:11:09+00:00",
"cve": "CVE-2026-20888",
"id": "CVE-2026-20888",
"initial_release_date": "2026-01-22T22:01:51.214000+00:00",
"product_status:known_not_affected": "9",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "gitea: Gitea Pull Requests Auto-Merge: Read-Only Users Can Cancel Scheduled Auto-Merge via Web Endpoint (Authorization Bypass)",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-20888.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-02-10T00:25:31Z",
"cve": "CVE-2026-20888",
"id": "CVE-2026-20888",
"initial_release_date": "2026-02-07T00:26:12Z",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-20888",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-20888.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-20888",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-01-23T21:09:52.298236Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-01-23T21:09:48.392Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Gitea Open Source Git Server",
"vendor": "Gitea",
"versions": [
{
"lessThanOrEqual": "1.25.3",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "reporter",
"value": "spingARbor"
}
],
"descriptions": [
{
"lang": "en",
"value": "Gitea does not properly verify authorization when canceling scheduled auto-merges via the web interface. A user with read access to pull requests may be able to cancel auto-merges scheduled by other users."
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-284",
"description": "CWE-284: Improper Access Control",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "CWE-862: Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-01-22T22:01:51.214Z",
"orgId": "88ee5874-cf24-4952-aea0-31affedb7ff2",
"shortName": "Gitea"
},
"references": [
{
"name": "GitHub Security Advisory",
"tags": [
"vendor-advisory"
],
"url": "https://github.com/go-gitea/gitea/security/advisories/GHSA-ccq9-c5hv-cf64"
},
{
"name": "GitHub Pull Request #36341",
"tags": [
"patch"
],
"url": "https://github.com/go-gitea/gitea/pull/36341"
},
{
"name": "GitHub Pull Request #36356",
"tags": [
"patch"
],
"url": "https://github.com/go-gitea/gitea/pull/36356"
},
{
"name": "Gitea v1.25.4 Release",
"tags": [
"release-notes"
],
"url": "https://github.com/go-gitea/gitea/releases/tag/v1.25.4"
},
{
"name": "Gitea v1.25.4 Release Blog Post",
"tags": [
"release-notes"
],
"url": "https://blog.gitea.com/release-of-1.25.4/"
}
],
"title": "Gitea Pull Requests Auto-Merge: Read-Only Users Can Cancel Scheduled Auto-Merge via Web Endpoint (Authorization Bypass)"
}
},
"cveMetadata": {
"assignerOrgId": "88ee5874-cf24-4952-aea0-31affedb7ff2",
"assignerShortName": "Gitea",
"cveId": "CVE-2026-20888",
"datePublished": "2026-01-22T22:01:51.214Z",
"dateReserved": "2026-01-08T23:02:37.542Z",
"dateUpdated": "2026-01-23T21:54:14.856Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…