CVE-2026-129427
Stored XSS via avatar upload chained with an authentication bypass in /Attachments leads to ATO
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
INFO
Published Date :
Nov. 14, 2026, 12:17 p.m.
Last Modified :
Nov. 14, 2026, 12:17 p.m.
Remotely Exploit :
Yes !
Source :
772f0079-75c2-41ca-913e-d9072716578b
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 772f0079-75c2-41ca-913e-d9072716578b | ||||
| CVSS 3.1 | HIGH | MITRE-CVE |
Solution
- Validate all user inputs for avatar uploads.
- Implement strict authentication and authorization checks.
- Update Cervantes to the latest secure version.
- Review and sanitize all attachment processing.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-129427.
| URL | Resource |
|---|---|
| https://www.grayback.es/advisories | |
| https://www.grayback.es/en/advisories |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-129427 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-129427
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-129427 vulnerability anywhere in the article.