EUVD-2026-70921
GHSA-w8gw-2cgm-wv2h
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Stored XSS requires authenticated content submission (PR:L) and victim page view (UI:R); scope changes to victim browser session (S:C), with limited confidentiality and integrity impact.
Primary rating from Vendor (CNA).
CVSS VectorVendor
Lifecycle Timeline
3Description PRE-NVD
Articles & Coverage 3
AnalysisAI
Stored cross-site scripting via markdown HTML processing in Apache Allura through 1.20.0 permits an authenticated attacker to inject persistent malicious scripts that execute in the browsers of other users who view the compromised content - wikis, ticket comments, blog posts, or discussion threads. The vulnerability stems from insufficient sanitization of HTML embedded within markdown-rendered content across the forge platform's collaborative features. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold an active account on the target Allura instance with write access to at least one markdown-capable area (wiki, ticket system, blog, or discussion board). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The assigned severity of 'Critical' appears overstated for a stored XSS absent evidence of direct server-side compromise or privilege escalation - stored XSS of this class typically scores in the medium-to-high range (CVSS 3.1 ~6.4) when prerequisites such as authenticated submission and victim page-view are accounted for. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade Apache Allura to version 1.21.0, which is confirmed by the vendor to fix this issue. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Apache Allura deployments running version 1.20.0 or earlier and document the scope of collaborative content (wikis, tickets, blogs, discussion threads) to assess organizational exposure. …
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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