Security Digest · Vulnerability record
CVE-2026-55742: Cotonti: Cross-Site Request Forgery in the administration rights handler
Cotonti 1.0.0 (master branch, commit f43f1fc3) is vulnerable to Cross-Site Request Forgery in the administration rights handler.
CVSS 9.4 Critical EPSS 0.2% · p10
Should you act?
Critical and remotely reachable
No known exploitation yet, but it is network-reachable without credentials. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- 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.
From the GitHub advisory
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. A remote attacker who lures an authenticated administrator into visiting a malicious page can force the browser to submit a forged request that grants elevated permissions to an attacker-controlled group, escalating privileges to administrator. Because Cotonti administrators can modify templates and configuration, this can be further leveraged toward remote code execution.
Weakness type: CWE-352.
Product: cotonti/cotonti (Composer (PHP)) · Assigned by: TuranSec · Published: 2026-06-18
Affected and fixed versions
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| Composer (PHP) | cotonti/cotonti | <= 1.0.0 | none listed |
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| Cotonti | Cotonti | 1.0.0 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| TuranSec | 3.1 | 9.6 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H |
| TuranSec | 4.0 | 9.4 Critical | 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 | 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 |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Attack requirements: none
- Privileges required: none (no login)
- User interaction: passive
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- 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.
Timeline
- — CVE record published by TuranSec
- — GitHub-reviewed advisory GHSA-7g3p-35vc-mgjr published (critical)
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vulnerability records
- GitHub Advisory GHSA-7g3p-35vc-mgjr github.com
- CVE.org record CVE-2026-55742 cve.org
- NVD entry CVE-2026-55742 nvd.nist.gov
Other references from the CVE record and advisory
- Vulnerable code: system/admin/admin.rights.php github.com
- github.com github.com
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