OpenFlagr <= 1.1.18 Authentication Bypass via Prefix Whitelist Path Normalization
Priority HIGH 81CWE-306Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-306.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01519 74th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed github.com/openflagr/flagr (Go): 0.0.0-20251009103504-fe83dc87aa40
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| OpenFlagr | Flagr | up to 1.1.18 | — | No fix listed | CNA |
| — | github.com/openflagr/flagr (Go) | before 0.0.0-20251009103504-fe83dc87aa40 | 0.0.0-20251009103504-fe83dc87aa40 | Patch available | GHSA-rwp9-5g7q-73q3 |
- Flagr VendorOpenFlagr Affected up to 1.1.18 Fixed in — No fix listed CNA
- github.com/openflagr/flagr (Go) Vendor— Affected before 0.0.0-20251009103504-fe83dc87aa40 Fixed in 0.0.0-20251009103504-fe83dc87aa40 Patch available GHSA-rwp9-5g7q-73q3
Remediation
- Fix · GHSA-rwp9-5g7q-73q3 github.com/openflagr/flagr (Go) Fixed in 0.0.0-20251009103504-fe83dc87aa40 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-0650
- 2026-10-03 Alias added: GHSA-rwp9-5g7q-73q3
References
Patch 1
Sources
- CVE-2026-0650 · CVE Program
- CVE-2026-0650 · NVD
- FIRST EPSS
- GHSA-rwp9-5g7q-73q3 · GitHub Advisory Database · CC BY 4.0
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