What is CVE-2021-25981?

CVE-2021-25981 is a critical-severity vulnerability in Debiki Talkyard, classified under Insufficient Session Expiration. CVSS score: 9.8/10. Published 2022-01-03.

How severe is CVE-2021-25981?

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

Vulnerability in Debiki Talkyard

CVE-2021-25981

In Talkyard, regular versions v0.2021.20 through v0.2021.33 and dev versions v0.2021.20 through v0.2021.34, are vulnerable to Insufficient Session Expiration. This may allow an attacker to reuse the admin’s still-valid session token even when logged-out, to gain admin privileges, given the attacker is able to obtain that token (via other, hypothetical attacks)

Published 2022-01-03 · 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: 0.025 (83.9th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 83.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · change: 0.000

Affected products

Debiki Talkyard — versions v0.2021.20, unspecified
Talkyard

Weakness classification (CWE)

CWE-613 — Insufficient Session Expiration

References

github.com/debiki/talkyard/commit/b0310df019887f3464895529c773bc7d85ddcf34 (Patch, Third Party Advisory)
github.com/debiki/talkyard/commit/b0712915d8a22a20b09a129924e8a29c25ae5761 (Patch, Third Party Advisory)
www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25981 (Patch, VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2021-25981?: CVE-2021-25981 is a critical-severity vulnerability in Debiki Talkyard, classified under Insufficient Session Expiration. CVSS score: 9.8/10. Published 2022-01-03.
How severe is CVE-2021-25981?: Critical severity. CVSS v3 base score is 9.8 out of 10.