What is CVE-2021-40642?

CVE-2021-40642 is a medium-severity vulnerability in Textpattern, classified under Missing Encryption of Sensitive Data. CVSS score: 4.3/10. Published 2022-06-29.

How severe is CVE-2021-40642?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Textpattern

CVE-2021-40642

Textpattern CMS v4.8.7 and older vulnerability exists through Sensitive Cookie in HTTPS Session Without 'Secure' Attribute via textpattern/lib/txplib_misc.php. The secure flag is not set for txp_login session cookie in the application. If the secure flag is not set, then the cookie will be transmitted in clear-text if the user visits any HTTP URLs within the cookie's scope. An attacker may be able to induce this event by feeding a user suitable links, either directly or via another web site.

Published 2022-06-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.005 (42.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000

Affected products

Textpattern

Weakness classification (CWE)

CWE-311 — Missing Encryption of Sensitive Data

References

github.com/textpattern/textpattern/commit/211fab0093999f59b0b61682aa988ac7d8337… (Patch, Third Party Advisory)
www.huntr.dev/bounties/aadbe434-a376-443b-876f-2a1cbab7847b/ (Permissions Required, Third Party Advisory)

Frequently asked questions

What is CVE-2021-40642?: CVE-2021-40642 is a medium-severity vulnerability in Textpattern, classified under Missing Encryption of Sensitive Data. CVSS score: 4.3/10. Published 2022-06-29.
How severe is CVE-2021-40642?: Medium severity. CVSS v3 base score is 4.3 out of 10.