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CVE Record

CVE-2025-13761: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.6 before 18.6.3, and 18.7 before 18.7.1 that could have allowed an unauthenticated user to execute arbitrary code in the context of an authenticated user's browser by convincing the legitimate user to visit a specially crafted webpage.

HighCVSS 8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This GitLab issue is a high-severity cross-site scripting vulnerability. An unauthenticated attacker could trick a legitimate, logged-in user into visiting a crafted webpage, causing attacker-controlled code to run in that user's browser context. The sources do not show CISA KEV listing or confirmed active exploitation.

Executive priority

Treat this as a high-priority patching item for affected GitLab deployments, especially where privileged users access sensitive repositories. It requires user interaction, but successful exploitation could compromise confidentiality and integrity in a logged-in user's browser session.

Technical view

CVE-2025-13761 is CWE-79 in GitLab CE/EE affecting versions 18.6 before 18.6.3 and 18.7 before 18.7.1. CVSS 3.1 is 8.0 with network attack vector, high complexity, no privileges, required user interaction, changed scope, and high confidentiality and integrity impact.

Likely exposure

Exposure is likely limited to GitLab CE/EE deployments running 18.6.x below 18.6.3 or 18.7.x below 18.7.1. The source bundle marks default status as unaffected outside those ranges.

Exploitation context

The documented scenario requires social engineering: an unauthenticated attacker must convince an authenticated GitLab user to visit a specially crafted webpage. KEV is false in the supplied data, and no cited source confirms active exploitation.

Researcher notes

The public summary identifies XSS but the linked GitLab issue and HackerOne report are marked permissions-required in the bundle. Avoid assuming payload mechanics, affected components, or exploit maturity beyond the CVE description and GitLab version ranges.

Mitigation direction

  • Upgrade GitLab 18.6.x deployments to 18.6.3 or later.
  • Upgrade GitLab 18.7.x deployments to 18.7.1 or later.
  • Check GitLab's patch release guidance for any additional vendor instructions.
  • Prioritize instances used by administrators or high-privilege project maintainers.

Validation and detection

  • Inventory all self-managed GitLab CE/EE instances and record exact versions.
  • Confirm no production instance runs 18.6 before 18.6.3.
  • Confirm no production instance runs 18.7 before 18.7.1.
  • Review GitLab release notes and vendor advisories for updated remediation guidance.
  • Check security monitoring for suspicious browser-session or account activity around GitLab users.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · medium confidence lookup

CWE-79: User-session and phishing behavior lookup

Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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.

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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2025-13761 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
8 (3.1)
Known Exploited
No
Published

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

Official CVE source material

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.

2CVSS vectors
5Timeline events
2ADP providers
7Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

CVSS vector scores

2 official scores

We 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.

ScoreVersionSeverityVectorExploitImpactSource
8CVSS 3.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N1.65.8GitLab
8CVSS 3.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N1.65.8redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

8High
CVSS 3.1 vector shape for CVE-2025-13761Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Made public.

  3. CVE publishedCVE Program

    The CVE record was published.

  4. ADP timelineredhat-SADP

    Reported to Red Hat.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPgitlab: GitLab: Cross-Site Scripting Vulnerability Leading to Arbitrary Code Execution
other:Red Hat severity ratingcvssV3_1
  • 2026-01-09T10:15:02.480Z: Reported to Red Hat.
  • 2026-01-09T10:04:01.331Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
GitLabGitLab18.6, 18.7unaffected
Weakness

CWE details

CWE-79

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-79 · source CWE mapping

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs