EUVD-2026-57344
GHSA-q6fp-vfv9-v477
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Network-reachable XSS needing a low-privilege account to post Markdown (PR:L) and a victim viewing it (UI:R); scope changes to the victim's browser (S:C) with limited confidentiality and integrity impact.
Primary rating from Vendor (apache).
CVSS VectorVendor: apache
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
3DescriptionCVE.org
XSS vulnerability in Markdown handling in Apache Allura.
This issue affects Apache Allura: from 1.10.0 before 1.19.1.
Users are recommended to upgrade to version 1.19.1, which fixes the issue.
AnalysisAI
Cross-site scripting in Apache Allura's Markdown rendering (versions 1.10.0 up to but not including 1.19.1) allows an attacker to inject script-related HTML into content that other users view, executing arbitrary JavaScript in their browsers. Because Allura is a collaborative forge where users routinely post Markdown in tickets, wiki pages, and comments, the payload is most likely stored and delivered to victims who open the affected page. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the ability to submit Markdown-formatted content to an Allura instance - access to a feature that accepts Markdown such as tickets, wiki pages, forum posts, or comments, which on most deployments means at least a registered low-privilege account. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | No CVSS score or vector was supplied by the source, so severity signals must be inferred and stated as such. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker uses an existing or newly registered low-privilege account to post a wiki page, ticket, or comment containing crafted Markdown that carries a script-bearing HTML tag or attribute. When a project maintainer or other user opens that page, the injected JavaScript runs in their authenticated session, enabling theft of session cookies or CSRF tokens or actions performed as the victim. … |
| Remediation | Vendor-released patch: upgrade Apache Allura to version 1.19.1 or later, as recommended in the Apache advisory (https://allura.apache.org/posts/2026-allura-1.19.1.html and https://lists.apache.org/thread/p7bd1yz9v9wbsbc6hz3tjxozxnwyzqz0). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all deployed Apache Allura instances and document their versions to identify affected systems; note that no public exploit has been identified at this time but remediation remains critical given the severity. …
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External POC / Exploit Code
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