---
title: "CVE-2026-55742: Cotonti: Cross-Site Request Forgery in the administration rights handler"
url: https://erroneo.us/security/cve/CVE-2026-55742/
description: "CVE-2026-55742 (cotonti/cotonti (Composer (PHP))): Cotonti 1.0.0 (master branch, commit f43f1fc3) is vulnerable to Cross-Site Request Forgery in the…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-06-18
date_modified: 2026-08-10
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-55742"
kev: false
cvss: 9.4
epss: 0.00208
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-55742: Cotonti: Cross-Site Request Forgery in the administration rights handler

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.2% , percentile 10: FIRST’s model estimates a 0.2% chance of exploitation activity in the next 30 days, higher than 10% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Only applies if your dependency tree includes cotonti/cotonti (Composer (PHP)) <= 1.0.0, no fixed version listed . Check your lockfile, including transitive dependencies.

## What it is

Cotonti 1.0.0 (master branch, commit f43f1fc3) is vulnerable to Cross-Site Request Forgery in the administration rights handler. In system/admin/admin.rights.php, the rights update action ('a=update') modifies group access rights (including via cotauthaddgroup) without calling cotcheckxg to validate the anti-CSRF token.

## Affected packages

- Composer (PHP) `cotonti/cotonti` <= 1.0.0 → fixed: none listed

## Affected products (CVE record)

- Cotonti Cotonti: 1.0.0

## Severity

- TuranSec CVSS 3.1: 9.6 `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`
- TuranSec CVSS 4.0: 9.4 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`
- GitHub CVSS 4.0: 9.4 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.21% probability of exploitation activity in the next 30 days; percentile 10.

## Sources

- [GitHub Advisory GHSA-7g3p-35vc-mgjr](https://github.com/advisories/GHSA-7g3p-35vc-mgjr)
- [CVE.org record CVE-2026-55742](https://www.cve.org/CVERecord?id=CVE-2026-55742)
- [NVD entry CVE-2026-55742](https://nvd.nist.gov/vuln/detail/CVE-2026-55742)
- [Vulnerable code: system/admin/admin.rights.php](https://github.com/Cotonti/Cotonti/blob/f43f1fc38ba4e02027786dad9dac1435c7c52b30/system/admin/admin.rights.php#L53)
- [github.com](https://github.com/Cotonti/Cotonti)

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Source page: https://erroneo.us/security/cve/CVE-2026-55742/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt