What is CVE-2026-23836?

CVE-2026-23836 is a critical-severity vulnerability in Hotcrp, classified under Improper Input Validation. CVSS score: 9.9/10. Published 2026-01-19.

How severe is CVE-2026-23836?

Critical severity. CVSS v3 base score is 9.9 out of 10.

Improper input validation in Hotcrp

CVE-2026-23836

HotCRP is conference review software. A problem introduced in April 2024 in version 3.1 led to inadequately sanitized code generation for HotCRP formulas which allowed users to trigger the execution of arbitrary PHP code. The problem is patched in release version 3.2.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.004 (31.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Hotcrp
Kohler Hotcrp — versions = 3.1

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2026-23836?: CVE-2026-23836 is a critical-severity vulnerability in Hotcrp, classified under Improper Input Validation. CVSS score: 9.9/10. Published 2026-01-19.
How severe is CVE-2026-23836?: Critical severity. CVSS v3 base score is 9.9 out of 10.