CVE-2026-20888 (GCVE-0-2026-20888)
Vulnerability from cvelistv5 – Published: 2026-01-22 22:01 – Updated: 2026-01-23 21:54
VLAI?
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)
Assigner
References
| URL | Tags | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
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Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Gitea | Gitea Open Source Git Server |
Affected:
0 , ≤ 1.25.3
(semver)
|
Credits
spingARbor
{
"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": [
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"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-01-23T21:09:52.298236Z",
"version": "2.0.3"
},
"type": "ssvc"
}
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"providerMetadata": {
"dateUpdated": "2026-01-23T21:54:14.856Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
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{
"defaultStatus": "unaffected",
"product": "Gitea Open Source Git Server",
"vendor": "Gitea",
"versions": [
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"lessThanOrEqual": "1.25.3",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"credits": [
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"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",
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"providerMetadata": {
"dateUpdated": "2026-01-22T22:01:51.214Z",
"orgId": "88ee5874-cf24-4952-aea0-31affedb7ff2",
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"tags": [
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],
"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": [
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],
"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)"
}
},
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"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": {
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"vulnrichment": {
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}
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Sightings
| Author | Source | Type | Date |
|---|
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.
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