Answer in brief
CVE-2026-91972 records a High severity (CVSS 7.5) vulnerability in Vikunja before 2.6.0 Authentication Bypass via Unthrottled API. The current sources do not mark it as known exploited. The current feed maps go-vikunja/vikunja (generic), code.vikunja.io/api (go), code.vikunja.io/api (go). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps go-vikunja/vikunja (generic), code.vikunja.io/api (go), code.vikunja.io/api (go). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| go-vikunja/vikunjageneric | >=0 <2.6.0 | 2.6.0 |
| code.vikunja.io/apigo | <=2.5.0 | 2.6.0 |
| code.vikunja.io/apigo | >=0 <2.6.0 | 2.6.0 |
Published upstream
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 15, 2026
Vikunja versions before 2.6.0 fail to apply rate limiting to /api/v2 public authentication endpoints including login, register, password-reset, and OAuth token routes. Remote unauthenticated attackers can perform unbounded credential guessing, account enumeration, and password-reset flooding attacks without throttling restrictions.
Quoted source text, attributed separately from HOL analysis.