Vulnerability · Published Sep 15, 2026 · Assigned by VulnCheck

CVE-2026-91982Vikunja before 2.6.0 TOTP Secret Disclosure via API

Medium 4.3

In plain English

A medium-severity security flaw in vikunja from go-vikunja. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.3%top 71.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Vikunja before 2.6.0 continues to expose the raw TOTP shared secret after enrollment through the GET /api/v1/user/settings/totp and /api/v1/user/settings/totp/qrcode endpoints without re-authentication. Attackers with a valid access token can read the secret, import it into their own authenticator, and generate valid codes indefinitely to defeat the second factor and enable account takeover.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	code.vikunja.io/api	2.6.0	GHSA-88f6-4rjv-x774
Go	code.vikunja.io/api	no fix listed	GO-2026-6722

Affected products (as reported)

Vendor	Product	Versions
go-vikunja	vikunja	0 – before 2.6.0

Weakness: CWE-522 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References

GitHub Security Advisory (GHSA-88f6-4rjv-x774) vendor-advisory
VulnCheck Advisory: Vikunja before 2.6.0 TOTP Secret Disclosure via API third-party-advisory