What is CVE-2021-26037?

CVE-2021-26037 is a medium-severity vulnerability in Joomla Joomla\!, classified under Insufficient Session Expiration. CVSS score: 5.3/10. Published 2021-07-07.

How severe is CVE-2021-26037?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Joomla Joomla\!

CVE-2021-26037

An issue was discovered in Joomla! 2.5.0 through 3.9.27. CMS functions did not properly termine existing user sessions when a user's password was changed or the user was blocked.

Published 2021-07-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.009 (56.8th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Joomla Joomla\!
Joomla! Project Cms — versions 2.5.0-3.9.27

Weakness classification (CWE)

CWE-613 — Insufficient Session Expiration

References

developer.joomla.org/security-centre/858-20210703-core-lack-of-enforced-session… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2021-26037?: CVE-2021-26037 is a medium-severity vulnerability in Joomla Joomla\!, classified under Insufficient Session Expiration. CVSS score: 5.3/10. Published 2021-07-07.
How severe is CVE-2021-26037?: Medium severity. CVSS v3 base score is 5.3 out of 10.