What’s Vulnerable › Vulnerabilities

CVE-2021-28373

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-03-13 · updated 2026-06-17
• Weakness: CWE-863

Description

The auth_internal plugin in Tiny Tiny RSS (aka tt-rss) before 2021-03-12 allows an attacker to log in via the OTP code without a valid password. NOTE: this issue only affected the git master branch for a short time. However, all end users are explicitly directed to use the git master branch in production. Semantic version numbers such as 21.03 appear to exist, but are automatically generated from the year and month. They are not releases.

Affected products

• Tt-Rss Tiny Tiny Rss: before 2021-03-12 — fixed in 2021-03-12

How to fix

Upgrade to a fixed version: Tt-Rss Tiny Tiny Rss 2021-03-12. Check the vendor advisory for mitigations.

References

• https://community.tt-rss.org/t/check-password-not-called-if-otp-is-enabled-update-asap-if-youre-using-2fa/4502
• https://git.tt-rss.org/fox/tt-rss/commit/4949e1a59059d9e72ba7a98f783cec312c06c6d2
• https://community.tt-rss.org/t/check-password-not-called-if-otp-is-enabled-update-asap-if-youre-using-2fa/4502
• https://git.tt-rss.org/fox/tt-rss/commit/4949e1a59059d9e72ba7a98f783cec312c06c6d2

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