Vulnerability in Hotcrp

CVE-2026-23878

HotCRP is conference review software. Starting in commit aa20ef288828b04550950cf67c831af8a525f508 and prior to commit ceacd5f1476458792c44c6a993670f02c984b4a0, authors with at least one submission on a HotCRP site could use the document API to download any documents (PDFs, attachments) associated with any submission. The problem was patched in commit ceacd5f1476458792c44c6a993670f02c984b4a0.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (20.6th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-23878: held from 0.003 to 0.003.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

  • Hotcrp — versions 3.1
  • Kohler Hotcrp — versions >= aa20ef288828b04550950cf67c831af8a525f508, < ceacd5f1476458792c44c6a993670f02c984b4a0

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-23878?
CVE-2026-23878 is a medium-severity vulnerability in Hotcrp, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 6.5/10. Published 2026-01-19.
How severe is CVE-2026-23878?
Medium severity. CVSS v3 base score is 6.5 out of 10.