What is CVE-2021-25979?

CVE-2021-25979 is a critical-severity vulnerability in Apostrophe, classified under Insufficient Session Expiration. CVSS score: 9.8/10. Published 2021-11-08.

How severe is CVE-2021-25979?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Apostrophe

CVE-2021-25979

Apostrophe CMS versions prior to 3.3.1 did not invalidate existing login sessions when disabling a user account or changing the password, creating a situation in which a device compromised by a third party could not be locked out by those means. As a mitigation for older releases the user account in question can be archived (3.x) or moved to the trash (2.x and earlier) which does disable the existing session.

Published 2021-11-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.011 (65.3th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: +0.000

Affected products

Apostrophe — versions unspecified, 2.63.0
Apostrophecms

Weakness classification (CWE)

CWE-613 — Insufficient Session Expiration

References

github.com/apostrophecms/apostrophe/commit/c211b211f9f4303a77a307cf41aac9b4ef8d… (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-25979?: CVE-2021-25979 is a critical-severity vulnerability in Apostrophe, classified under Insufficient Session Expiration. CVSS score: 9.8/10. Published 2021-11-08.
How severe is CVE-2021-25979?: Critical severity. CVSS v3 base score is 9.8 out of 10.