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 GitLab CE/EE 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, resulting in improper neutralization of input during web page generation. Under those conditions, an unauthenticated attacker could 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 session-context actions, theft of session data or other browser-accessible sensitive information, manipulation of application content presented to the user, and performance of actions on behalf of the victim within GitLab. The provided content characterizes the confidentiality, integrity, and availability impacts as high and notes changed scope.

Mitigation

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

If immediate patching is not possible, reduce exposure of vulnerable GitLab instances to untrusted users where feasible, closely review and harden controls around Web IDE access paths, and verify path validation behavior in the affected asset handler. The provided content specifically notes verifying path validation controls and reviewing user session security as mitigation measures, but patching is the primary corrective action.

Remediation

Patch, then assume compromise.

Upgrade GitLab CE/EE to a fixed release: 18.11.6 or later for the 18.10 release line, 19.0.3 or later for the 19.0 release line, or 19.1.1 or later for the 19.1 release line. GitLab strongly recommended that self-managed installations upgrade immediately. GitLab.com was already patched according to the provided content.

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.

ACTIVITY FEED

Recent activity

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

8 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

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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 activity4

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