Quick answers
- Is CVE-2026-93872 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-93872 being exploited in the wild.
- How severe is CVE-2026-93872?
- High severity, with a CVSS score of 7.5, published 18 September 2026.
- Which products and versions are affected?
- Cotonti 1.0.0.
- Is there a fix for CVE-2026-93872?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-93872 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-93872?
- Check whether you run Cotonti at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability exists in the comments plugin's EditAction controller, which passes a base64-decoded parameter directly to PHP's unserialize() function without restricting object instantiation through the allowed_classes parameter. An authenticated attacker with comment write permissions can craft a malicious serialized payload to trigger gadget chain exploitation, resulting in file write or arbitrary code execution.
Affected products
- Cotonti Cotonti 1.0.0
Timeline
- 2026-09-18: disclosed