What is CVE-2026-71294?

CVE-2026-71294 is a high-severity vulnerability in Cotonti, classified under Deserialization of Untrusted Data. CVSS score: 7.6/10. Published 2026-08-05.

How severe is CVE-2026-71294?

High severity. CVSS v3 base score is 7.6 out of 10.

Is CVE-2026-71294 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Deserialization in Cotonti

CVE-2026-71294

Cotonti CMS's Comments plugin deserializes user-supplied data without restricting the classes that may be instantiated. In plugins/comments/controllers/actions/CreateAction.php, a POST parameter obtained via (trim-only sanitization) is passed to with no restriction, reachable by any member with write access to comments (the default setting in plugins/comments/comments.setup.php).

Vulnerability class: Insecure Deserialization

EPSS: 0.002 (13.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L.

Affected products

Cotonti — versions 0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

Public proof-of-concept exploits

HarshRajSinghania/cotonti-commentswidget-poc

References

309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (third-party-advisory)
309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (third-party-advisory)

Frequently asked questions

What is CVE-2026-71294?: CVE-2026-71294 is a high-severity vulnerability in Cotonti, classified under Deserialization of Untrusted Data. CVSS score: 7.6/10. Published 2026-08-05.
How severe is CVE-2026-71294?: High severity. CVSS v3 base score is 7.6 out of 10.
Is CVE-2026-71294 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.