Vulnerability record/PUBLISHED/Published Nov 14, 2026 11:19:54 UTC

CVE-2026-129427

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

Base score8.7/ 10

SeverityHighCVSS 3.1

Exploitability / impact

CVSS metric breakdown

Vector-derived attributes

Base severityHigh

Attack vectorNetworkAV

Attack complexityLowAC

Privileges requiredLowPR

User interactionRequiredUI

ScopeChangedS

Confidentiality impactHighC

Integrity impactHighI

Availability impactNoneA

CVSS vector stringCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

CVSS communicates standardized severity and impact characteristics. It does not establish whether a system is exploitable in your specific environment.

Record context

CVE Numbering AuthorityGrayback

Last updatedNov 14, 2026 11:19:54 UTC

PublishedNov 14, 2026 11:19:54 UTC

ReservedNov 14, 2026 11:12:40 UTC

Credits

Miguel Segovia Gil