What is CVE-2020-15906?

CVE-2020-15906 is a critical-severity vulnerability in Tiki, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 9.8/10. Published 2020-10-22.

How severe is CVE-2020-15906?

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

Is CVE-2020-15906 known to be exploited?

19 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Tiki

CVE-2020-15906

tiki-login.php in Tiki before 21.2 sets the admin password to a blank value after 50 invalid login attempts.

Published 2020-10-22 · 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: 0.272 (98.0th percentile), scored 2026-10-01.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.272 · newest: 0.272 · change: 0.000

Affected products

Tiki

Weakness classification (CWE)

CWE-307 — Improper Restriction of Excessive Authentication Attempts

Public proof-of-concept exploits

References

packetstormsecurity.com/files/159663/Tiki-Wiki-CMS-Groupware-21.1-Authenticatio… (Exploit, VDB Entry, Third Party Advisory)
info.tiki.org/article473-Security-Releases-of-all-Tiki-versions-since-16-3 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2020-15906?: CVE-2020-15906 is a critical-severity vulnerability in Tiki, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 9.8/10. Published 2020-10-22.
How severe is CVE-2020-15906?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2020-15906 known to be exploited?: 19 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.