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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

CVE-2025-13761 is a high-severity GitLab cross-site scripting issue. An unauthenticated attacker could target a logged-in GitLab user by getting them to visit a crafted webpage, causing code to run in that user’s browser context. This creates meaningful confidentiality and integrity risk for affected GitLab versions.

Executive priority

Treat this as urgent patching for affected GitLab environments, especially where administrators or developers handle sensitive repositories. It is not confirmed as actively exploited in the supplied sources, but successful exploitation could compromise data viewed or changed through an authenticated user’s browser.

Technical view

GitLab CE/EE versions 18.6 before 18.6.3 and 18.7 before 18.7.1 are affected by CWE-79 improper input neutralization during web page generation. CVSS 8.0 reflects network reachability, no privileges required, required user interaction, high attack complexity, changed scope, and high confidentiality and integrity impact.

Likely exposure

Exposure applies to GitLab CE/EE deployments running 18.6.x below 18.6.3 or 18.7.x below 18.7.1. Risk depends on authenticated users interacting with attacker-controlled crafted webpages. The supplied bundle does not identify other affected products or platforms.

Exploitation context

The source bundle does not show CISA KEV listing or public evidence of active exploitation. The GitLab issue and HackerOne report are permission-restricted, so detailed exploit evidence is unavailable. The CVSS vector indicates exploitation requires user interaction and high attack complexity.

Researcher notes

Public technical detail is limited because primary GitLab and HackerOne references require permissions. Analysis should stay anchored to the CVE record, GitLab patch release, and Red Hat entries. Do not assume exploit availability, affected branches beyond 18.6 and 18.7, or mitigations not named by the vendor.

Mitigation direction

  • Upgrade affected GitLab 18.6 deployments to 18.6.3 or later.
  • Upgrade affected GitLab 18.7 deployments to 18.7.1 or later.
  • Check GitLab’s patch release guidance for operational upgrade details.
  • Prioritize systems with internet-facing access or high-privilege GitLab users.

Validation and detection

  • Inventory GitLab CE/EE versions across production and non-production environments.
  • Confirm no 18.6.x instance is below 18.6.3.
  • Confirm no 18.7.x instance is below 18.7.1.
  • Review vendor advisory status before closing remediation tickets.
  • Document compensating controls if immediate upgrade is delayed.
Prepared
Confidence
medium
Sources
6

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