CVE-2021-29435

Name: CVE-2021-29435
Creator: NVD / NIST
Published: 2021-04-13T20:15:21.907+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.66%

Last modified Jun 17, 2026

CVE-2021-29435 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. trestle-auth is an authentication plugin for the Trestle admin framework. A vulnerability in trestle-auth versions 0.4.0 and 0.4.1 allows an attacker to create a form that will bypass Rails' built-in CSRF protection when submitted by a victim with a trestle-auth admin session. EPSS estimates a 0.66% chance of exploitation in the next 30 days.

Description

trestle-auth is an authentication plugin for the Trestle admin framework. A vulnerability in trestle-auth versions 0.4.0 and 0.4.1 allows an attacker to create a form that will bypass Rails' built-in CSRF protection when submitted by a victim with a trestle-auth admin session. This potentially allows an attacker to alter protected data, including admin account credentials. The vulnerability has been fixed in trestle-auth 0.4.2 released to RubyGems.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

EPSS Probability

0.66%

46.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-352

Affected Software

Vendor	Product	Versions
Trestle-Auth Project	Trestle-Auth	0.4.0
Trestle-Auth Project	Trestle-Auth	0.4.1

References

https://github.com/TrestleAdmin/trestle-auth/commit/cb95b05cdb2609052207af07b4b8dfe3a23c11dcPatch, Third Party Advisory
https://github.com/TrestleAdmin/trestle-auth/security/advisories/GHSA-h8hx-2c5r-32cfThird Party Advisory
https://rubygems.org/gems/trestle-authProduct, Third Party Advisory
https://github.com/TrestleAdmin/trestle-auth/commit/cb95b05cdb2609052207af07b4b8dfe3a23c11dcPatch, Third Party Advisory
https://github.com/TrestleAdmin/trestle-auth/security/advisories/GHSA-h8hx-2c5r-32cfThird Party Advisory
https://rubygems.org/gems/trestle-authProduct, Third Party Advisory

Timeline

Published: Apr 13, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-29435?

How severe is CVE-2021-29435?

CVE-2021-29435 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.66% probability of exploitation in the next 30 days.

How do I fix CVE-2021-29435?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-29435?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST