CVE-2025-8405 json
Improper Encoding or Escaping of Output in GitLab
published 10mo ago modified 5d ago also BIT-gitlab-2025-8405 , EUVD-2025-202646
- cvss
- 7.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 44%
- public exploits
- 0
- none known
Summary
GitLab has remediated a security issue in GitLab CE/EE affecting all versions from 17.1 before 18.4.6, 18.5 before 18.5.4, and 18.6 before 18.6.2 that could have allowed an authenticated user to perform unauthorized actions on behalf of other users by injecting malicious HTML into vulnerability code flow displays.
Patch / fix
- bitnami gitlab 18.4.6, 18.5.4, 18.6.2
- GitLab GitLab 18.4.6, 18.5.4, 18.6.2
Is CVE-2025-8405 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 10mo ago
Exploit prediction
0.52% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- hackerone.com https://hackerone.com/reports/3270940 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.7 | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N |
| OSV | 3.1 | 7.7 | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | gitlab | >=17.1.0, <18.4.6 >=18.5.0, <18.5.4 >=18.6.0, <18.6.2 |
18.4.6 18.5.4 18.6.2 |
Affected products
- GitLab GitLab
Classification
- Weakness
-
- CWE-116 Improper Encoding or Escaping of Output
- Technology feeds
References
-
hackerone.com
/reports/3270940
technical-description, exploit, permissions-required, web
-
about.gitlab.com
/releases/2025/12/10/patch-release-gitlab-18-6-2-released/
release-notes, vendor-advisory, advisory
-
gitlab.com
/gitlab-org/gitlab/-/issues/558214
issue-tracking, permissions-required, broken-link, web
-
nvd.nist.gov
/vuln/detail/CVE-2025-8405
web
Sources
- CVE List CVE-2025-8405
- NVD CVE-2025-8405
- OSV BIT-gitlab-2025-8405
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.