Unrated

XSS in GitLab Web IDE workbench asset handler

IdentifiersCVE-2026-10712CWE-79

CVE-2026-10712 is a high-severity cross-site scripting vulnerability in GitLab Community Edition and Enterprise Edition. It affects versions 18.10 before 18.11.6, 19.0 before 19.0.3, and 19.1 before 19.1.1. According to the provided content, the flaw is in the Web IDE workbench asset handler and is caused by improper path validation under certain conditions, which results in improper neutralization of input during web page generation. Successful exploitation could allow an unauthenticated attacker to cause arbitrary JavaScript to execute in a victim user's browser session.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows arbitrary JavaScript execution in the context of a victim user's browser session. This can enable typical XSS outcomes within that user's GitLab session, including session compromise, execution of unauthorized actions as the victim, access to data visible to the victim, and manipulation of application content or workflow in the browser.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, reduce exposure to the vulnerable Web IDE workbench asset handler where operationally feasible, closely review and harden path validation behavior around asset handling, and monitor for suspicious requests or browser-side abuse targeting Web IDE resources. Review user session security and apply standard XSS risk-reduction controls, but the primary mitigation in the provided content is upgrading to a fixed version.

Remediation

Patch, then assume compromise.

Upgrade GitLab CE/EE to a patched release. Fixed versions identified in the provided content are 18.11.6 or later for the 18.11 release line, 19.0.3 or later for the 19.0 release line, and 19.1.1 or later for the 19.1 release line. GitLab.com was already patched according to the provided content, and self-managed installations were advised to upgrade immediately.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

GitLabGitlabapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

9 SOURCESView more in app

security weekNews

Jun 25, 2026

GitLab Patches Code Execution, Information Disclosure Vulnerabilities - SecurityWeek

A high-severity cross-site scripting vulnerability in the GitLab Web IDE workbench asset handler that could allow unauthenticated attackers to execute JavaScript in users' browser sessions.

cvefeed high severityNews

Jun 25, 2026

CVE-2026-10712 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab

An XSS vulnerability in GitLab CE/EE caused by improper path validation that could allow an unauthenticated attacker to execute arbitrary JavaScript in a user's browser session.

docs gitlabNews

Nov 1, 2018

GitLab Patch Release: 19.1.1, 19.0.3, 18.11.6 | GitLab Docs

A high-severity cross-site scripting vulnerability in the GitLab Web IDE workbench asset handler that could allow an unauthenticated attacker to execute arbitrary JavaScript in a user’s browser session.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity5

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2026-10712

NVD

nvd.nist.gov/vuln/detail/CVE-2026-10712

MITRE CWE · CWE-79

cwe.mitre.org