CVE-2026-93869
Cotonti through 1.0.0 Open Redirect via Unanchored cot_url_check() Regex
- State
- Published
- Severity
- 5.3 Medium
- Published
- Sep 18, 2026
- Updated
- Sep 24, 2026
- Reserved
- Sep 18, 2026
Description
Cotonti through 1.0.0 contains an open redirect vulnerability in the cot_url_check() function that validates redirect destinations using a regular expression lacking an end-of-string anchor. Attackers can bypass the redirect guard by supplying hostnames beginning with the site domain to redirect users to attacker-controlled hosts through the ratings plugin or other redirect callers.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N | VulnCheck |
| 3.1 | 6.1 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-601 URL Redirection to Untrusted Site ('Open Redirect')
Affected Products
| Product | Versions |
|---|---|
CotontiCotonti |
|
References
- https://github.com/Cotonti/Cotonti/issues/1891issue-tracking
- https://github.com/Cotonti/Cotonti/pull/1899patchissue-tracking
- https://github.com/Cotonti/Cotonti/blob/1.0.0/system/functions.phptechnical-description
- https://github.com/Cotonti/Cotonti/blob/1.0.0/plugins/ratings/ratings.ajax.phptechnical-description
- https://github.com/Cotonti/Cotontiproduct
- VulnCheck Advisory: Cotonti through 1.0.0 Open Redirect via Unanchored cot_url_check() Regexthird-party-advisory
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