Security readout for executives and security teams
Plain-English summary
CVE-2026-20883 is an information disclosure issue in Gitea. A user whose access to a private repository was revoked may still see repository names and issue titles through a stopwatch they started earlier. This does not indicate code execution or data modification, but it can expose sensitive project metadata after offboarding or access changes.
Executive priority
Treat this as a targeted confidentiality issue, not a broad system compromise. Prioritize remediation where Gitea hosts sensitive private projects or where contractor/offboarding access changes are frequent. Upgrade planning should be timely but not emergency unless exposed metadata is business-sensitive.
Technical view
Gitea’s stopwatch API failed to re-check repository permissions when returning stopwatch data. The issue is classified as CWE-284 and has CVSS 6.5: network reachable, low complexity, authenticated access required, confidentiality impact high, no integrity or availability impact. Public sources point to fixes via Gitea pull requests and the v1.25.4 release.
Likely exposure
Exposure is most relevant to Gitea deployments using private repositories and stopwatch/time-tracking features. The attacker must be an authenticated user who previously had repository access and started a stopwatch before access was revoked. The provided bundle does not give a complete affected version range.
Exploitation context
No active exploitation is stated in the provided sources, and the CVE is not marked KEV. Abuse requires prior legitimate access and an existing stopwatch tied to a now-private or revoked repository context. The impact is limited to disclosure of issue titles and repository names, based on the description.
Researcher notes
The source bundle confirms the flaw class, impact, CVSS vector, advisory, patch PRs, and v1.25.4 release references. It does not provide a full affected version range. Avoid assuming broader data exposure beyond repository names and issue titles unless vendor details confirm it.
Mitigation direction
- Review the Gitea advisory for exact affected versions and upgrade guidance.
- Apply the fixed Gitea release or vendor-provided patches referenced by v1.25.4.
- Prioritize instances with private repositories and time-tracking or stopwatch usage.
- Review access revocation processes for users with prior private repository access.
Validation and detection
- Inventory all Gitea instances and record installed versions.
- Compare versions against the Gitea advisory and v1.25.4 release notes.
- Identify private repositories with stopwatch or time-tracking usage.
- Confirm revoked users cannot view private repository or issue metadata through stopwatch API behavior.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-284: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-20883 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- GitHub Security AdvisoryCVE reference · vendor-advisory
- GitHub Pull Request #36340CVE reference · patch
- GitHub Pull Request #36368CVE reference · patch
- Gitea v1.25.4 ReleaseCVE reference · release-notes
- Gitea v1.25.4 Release Blog PostCVE reference · release-notes
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.