CVE-2025-8405 | BDVDB-2026-305404 Detail

GitLabGitLab

Description#

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.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact none. Attack vector: network.

Weaknesses#

CWE-116 Improper Encoding or Escaping of Output

References#

Exploit#

https://hackerone.com/reports/3270940

History#

Version 12025-12-11Record published in the CVE List.
Version 22026-11-04Most recent update recorded in the CVE List.

Published

Published: 2025-12-11
Last modified: 2026-11-04

Vendor information

Vendor: GitLab
Product: GitLab

All GitLab vulnerabilities

Score

7.7 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 44.1.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 17.1 and < 18.4.6
Fixed
18.4.6
Vulnerable
>= 18.5 and < 18.5.4
Fixed
18.5.4
Vulnerable
>= 18.6 and < 18.6.2
Fixed
18.6.2

Scoring System

CVSS v4.0

Not available

CVSS v3.1

7.7 High

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N

Metric breakdown
Attack Vector	Network
Attack Complexity	High
Privileges Required	Low
User Interaction	Required
Scope	Changed
Confidentiality	High
Integrity	High
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).