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Description

OpenFlagr versions prior to and including 1.1.18 contain an authentication bypass vulnerability in the HTTP middleware. Due to improper handling of path normalization in the whitelist logic, crafted requests can bypass authentication and access protected API endpoints without valid credentials. Unauthorized access may allow modification of feature flags and export of sensitive data.

PUBLISHED Reserved 2026-01-06 | Published 2026-01-07 | Updated 2026-01-07 | Assigner VulnCheck




CRITICAL: 9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-306 Missing Authentication for Critical Function

CWE-425 Direct Request ('Forced Browsing')

Product status

Default status
unaffected

Any version
affected

Credits

DreyAnd finder

References

github.com/openflagr/flagr/releases/tag/1.1.19 release-notes patch

dreyand.rs/...drun-openflagr-less-1118-authentication-bypass technical-description exploit

www.vulncheck.com/...via-prefix-whitelist-path-normalization third-party-advisory

cve.org (CVE-2026-0650)

nvd.nist.gov (CVE-2026-0650)

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