EUVD-2026-78169
GHSA-p8xj-r4q8-q652
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Any remote ActivityPub actor can deliver content with no target privileges (PR:N); a click is required (UI:R); XSS executes in instance origin causing scope change (S:C); session/integrity impact is limited (C:L/I:L).
Primary rating from Vendor (vulncheck).
CVSS VectorVendor: vulncheck
Lifecycle Timeline
1DescriptionCVE.org
Takahe through 0.11.0 fails to restrict URL schemes in link hrefs within federated post content and profile summaries, allowing remote actors to inject javascript: links. Attackers can deliver federated content with malicious javascript: hrefs that execute in the instance origin when clicked, enabling session hijacking or impersonation of viewers.
AnalysisAI
Cross-site scripting in Takahe through 0.11.0 allows any remote ActivityPub actor to inject executable javascript: scheme URLs into federated post content or profile summaries. The sanitizer in core/html.py does not block this URL scheme when processing inbound federated HTML, so a crafted link persists in the instance's rendered content. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The target server must be running Takahe version 0.11.0 or earlier with default federation enabled (the standard deployment mode). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 5.3 (Medium) is well-calibrated for this class of vulnerability: the attack is network-reachable with no complexity or attacker privileges required, but user interaction (clicking a link) gates exploitation. … 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 | No vendor-released patched version is independently confirmed from the available data; the fix references point only to the upstream repository and an open GitHub issue (#728) rather than a tagged release. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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