CVE-2025-2254Network attack vector

Session impersonation via unencoded snippet output

Published Jun 12, 2025 · Updated Jun 12, 2025

Cross-site scripting in affected GitLab releases allows remote authenticated users to act in a snippet viewer's session. The snippet viewer fails to encode attacker-controlled output before inserting it into a rendered page, but GitLab has not disclosed the exact rendering function or encoding path. A low-privileged account must plant the content and a legitimate user must view it; the resulting script receives that viewer's browser-session authority.

CVSS severity8.7
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in affected GitLab releases allows remote authenticated users to act in a snippet viewer's session. The snippet viewer fails to encode attacker-controlled output before inserting it into a rendered page, but GitLab has not disclosed the exact rendering function or encoding path. A low-privileged account must plant the content and a legitimate user must view it; the resulting script receives that viewer's browser-session authority.

The record

CVE
CVE-2025-2254
Published
Jun 12, 2025
Updated
Jun 12, 2025
Vendor
GitLab
Product
GitLab
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 12, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 12, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=17.11 <17.11.4
  2. Affected versionversion=17.9 <17.10.8
  3. Affected versionversion=18.0 <18.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=17.11 <17.11.4; version=17.9 <17.10.8; version=18.0 <18.0.2

Published CVSS scores

8.7GitLabCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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