Stored XSS via avatar upload chained with an authentication bypass in /Attachments leads to ATO

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-129427
StatePUBLISHED
AssignerGrayback
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-14 12:17:44 UTC
Updated2026-11-14 12:17:44 UTC
DescriptionStored 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

Risk And Classification

Primary CVSS: v3.1 8.7 HIGH from 772f0079-75c2-41ca-913e-d9072716578b

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

Problem Types: CWE-79 | CWE-79 CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')

VersionSourceTypeScoreSeverityVector
3.1772f0079-75c2-41ca-913e-d9072716578bSecondary8.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
3.1CNACVSS8.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA CervantesSec Cervantes affected alpha 0.3 1.3-beta custom Not specified
CNA CervantesSec Cervantes unaffected v.1.4.0-beta Not specified

References

ReferenceSourceLinkTags
www.grayback.es/en/advisories 772f0079-75c2-41ca-913e-d9072716578b www.grayback.es
www.grayback.es/advisories 772f0079-75c2-41ca-913e-d9072716578b www.grayback.es
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Miguel Segovia Gil (en)

© CVE.report 2026

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report