CVE-2026-128023 json
FrankenPHP before 1.13.0 Authentication Bypass via Dot-Form Header Name Aliasing
published last mo. modified 2d ago also EUVD-2026-125079 , GHSA-qcrp-8483-f2f2
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository php/frankenphp. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 7.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 40%
- public exploits
- 0
- none known
Summary
FrankenPHP before 1.13.0 contains an authentication bypass vulnerability that allows unauthenticated attackers to spoof trusted headers by sending dot-form header names that PHP rewrites to underscores. Attackers can send headers like X.Authenticated.User or X.Forwarded.For that map to $_SERVER keys, spoofing user identity, client IP, or scheme.
Patch / fix
- php frankenphp 1.13.0
Is CVE-2026-128023 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
0.46% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-14).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.1 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N |
| CNA | 3.1 | 7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
| CNA | 4.0 | 9.1 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected products
- php frankenphp
Classification
- Weakness
-
- CWE-290 Authentication Bypass by Spoofing
References
-
github.com
/php/frankenphp/security/advisories/GHSA-qcrp-8483-f2f2
vendor-advisory, advisory
-
vulncheck.com
/advisories/frankenphp-before-1.13.0-authentication-bypass-via-dot-form-header-name-aliasing
third-party-advisory
Sources
- CVE List CVE-2026-128023
- NVD CVE-2026-128023
- Maintainer advisory GHSA-qcrp-8483-f2f2
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of php/frankenphp published their own advisory on GitHub. Reviewed sources take precedence over it.