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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[17.7,18.8.7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[18.9,18.9.3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[18.10,18.10.1)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "GitLab", "source": "cna", "vendor": "GitLab"}, "product": "gitlab", "vendor": "gitlab"}], "analysis": {"en": {"generated_at": "2026-03-25T18:24:50.133538+00:00", "value": {"mitigation_remediation": ["Apply the latest GitLab patch by upgrading to version 18.8.7, 18.9.3, 18.10.1, or any newer release.", "Verify that Mermaid diagram rendering remains enabled only for trusted contributors; consider disabling diagrams if an immediate upgrade is not possible."], "summary": {"action": "Immediate Patch", "impact": "Cross\u2011Site Scripting allowing arbitrary JavaScript execution in a victim\u2019s browser"}, "threat_synthesis": {"affected_systems": "All GitLab Community Edition and Enterprise Edition installations from version 17.7 through any 18.8 release before 18.8.7, every 18.9 release before 18.9.3, and every 18.10 release before 18.10.1 are affected. The affected products are GitLab\u2019s web application components that render user\u2011submitted Mermaid diagrams.", "description_and_impact": "The vulnerability is caused by improper sanitization of entity\u2011encoded characters within Mermaid diagrams. An attacker who is authenticated to the GitLab instance can embed malicious JavaScript into a diagram that is rendered as part of a web page. When a user views the diagram, the script executes in the context of the user\u2019s browser, permitting data theft, session hijacking, or further manipulation of the internal web application. The weakness is identified as CWE\u201179 (XSS).", "risk_and_exploitability": "The CVSS v3.1 score is 5.4, indicating a moderate severity. The EPSS score is not available and the vulnerability is not listed in CISA\u2019s KEV catalog, but exploitation requires an authenticated session. If an attacker successfully authenticates, the XSS flaw can be triggered without additional prerequisites, making it a realistic risk for environments where users have editing permissions for project documentation. The lack of an exploit published in the wild suggests that the timeline for impact may be limited to enterprises that have not yet upgraded."}}}}, "created": "2026-03-25T21:46:52.186379+00:00", "updated": "2026-03-26T11:34:35.033525+00:00", "vendors": ["gitlab", "gitlab$PRODUCT$gitlab"]}