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VulnerabilityPublished

CVE-2026-129427: CervantesSec cervantes · Cross-site Scripting

Affects CervantesSec cervantesSource CVE Database V5

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Not known to be exploited · CVSS 8.7 High.

Data as of 14 Nov 2026, 11:32 UTC

CVSS 3.1 base score
8.7High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (Grayback)CVSS 3.18.7
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 14 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
CervantesSeccervantesAffected
  • ≥ alpha 0.3, ≤ 1.3-beta
Fixed in–

AI-suggested

Until a fix is available, restrict avatar upload functionality and monitor for suspicious activity related to /Attachments endpoint. Apply strict input validation and sanitization on avatar uploads to mitigate XSS risks.

Description

CVE-2026-129427 is a stored cross-site scripting (XSS) vulnerability in CervantesSec cervantes version v1.3-beta. It involves an attacker uploading a malicious avatar that exploits an authentication bypass in the /Attachments endpoint, leading to account takeover (ATO) by executing arbitrary code in another user's browser with elevated privileges.

References

Community reviews

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