Jenkins Tuleap Authentication Plugin non-constant time token comparison

MEDIUM 5.9CVE-2023-40343 · GHSA-5r33-mgjf-6656 · Published 16/08/2023 · updated 17/06/2026

In short

CVE-2023-40343 is a MEDIUM (CVSS 5.9) vulnerability affecting io.jenkins.plugins:tuleap-oauth, tuleap authentication (jenkins).
Chance of exploitation in the next 30 days (EPSS): 0.59%, higher than 48.3% of all vulnerabilities.
Fix: update to 1.1.21 or later.

Package	Affected versions	Patched versions
io.jenkins.plugins:tuleap-oauth Maven	`< 1.1.21`	`1.1.21`
tuleap authentication jenkins	`≤ 1.1.20`	No fix yet

Description

Jenkins Tuleap Authentication Plugin 1.1.20 and earlier does not use a constant-time comparison when checking whether two authentication tokens are equal.

This could potentially allow attackers to use statistical methods to obtain a valid authentication token.

Tuleap Authentication Plugin 1.1.21 uses a constant-time comparison when validating authentication tokens.

NVD description

Jenkins Tuleap Authentication Plugin 1.1.20 and earlier uses a non-constant time comparison function when validating an authentication token allowing attackers to use statistical methods to obtain a valid authentication token.

References

nvd.nist.gov/vuln/detail/CVE-2023-40343 · ADVISORY
jenkins.io/security/advisory/2023-08-16 · WEB
openwall.com/lists/oss-security/2023/08/16/3 · WEB

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