CVE-2026-55742 Cotonti CSRF in admin.rights.php allows privilege escalation
Attackers can force admins to change group access rights via CSRF, leading to privilege escalation in Cotonti CMS.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-55742?
CVE-2026-55742 is a critical vulnerability in Cotonti, published on 18 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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 cot_auth_add_group) without calling cot_check_xg to validate the anti-CSRF token.
Weakness: CWE-352
Which versions are affected by CVE-2026-55742?
2 open source packages ship an affected version, including cotonti/cotonti.
| Package | Affected | Fixed in |
|---|---|---|
cotonti/cotonti Packagist | All versions to 1.0.0 | None |
cotonti/cotonti Packagist | All versions to 1.0.0 | None |
How do I fix CVE-2026-55742?
No fix has been published for CVE-2026-55742 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-55742 being exploited?
There is no known exploitation of CVE-2026-55742 in the wild and no public exploit code.
Sources
Also known as GHSA-7g3p-35vc-mgjr.