CVE-2026-129427
Stored XSS via avatar upload chained with an authentication bypass in /Attachments leads to ATO
- High 8.7
Description
Stored XSS via avatar upload chained with an authentication bypass in /Attachments leads to ATO in Cervantes version v1.3-beta could allow an attacker to execute arbitrary code in another user's browser with elevated privileges
Key facts
- Published
- 14 Nov 2026
- Last changed
- 14 Nov 2026
- Assigned by
- Grayback
- EPSS
- 0.367% likely to be exploited in the next 30 days, higher than 31.016% of CVEs (scores for 15 Nov 2026)
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 8.7CVSS 3.1, Highfrom the CNA (Grayback)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
No explicit remediation statement is available on this page yet. Consult the original record and vendor references before choosing a fix.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| CervantesSec | cervantes |
|
Timeline
- 14 Nov 2026 Published
Weakness
Practice this bug class
HackZoneLabs has a hands-on lab on XSS (stored, reflected, DOM) (CWE-79).