CVE-2026-128025 json
FrankenPHP before 1.13.0 CGI Path-Split Boundary Bypass via splitPos
published last mo. modified yesterday also EUVD-2026-125077 , GHSA-xxjp-cjxr-2x6m
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
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 25%
- public exploits
- 0
- none known
Summary
FrankenPHP before 1.13.0 contains a path-split interpretation conflict in splitPos in cgi.go that allows unauthenticated attackers to execute protected PHP scripts by embedding .php inside a filename component. Attackers can request paths like /uploads/a.php.txt/b.php to execute uploads/a.php despite route-level or WAF deny rules and forge PATH_INFO, SCRIPT_NAME, and PHP_SELF values.
Patch / fix
- php frankenphp 1.13.0
Is CVE-2026-128025 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 FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- partial
- Assessed
- yesterday
Exploit prediction
0.32% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-14).
Exploits and checks
- github.com https://github.com/php/frankenphp/security/advisories/GHSA-xxjp-cjxr-2x6m referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.9 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N |
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
| CNA | 4.0 | 6.9 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/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 |
Affected products
- php frankenphp
Classification
- Weakness
-
- CWE-436 Interpretation Conflict
References
-
github.com
/php/frankenphp/security/advisories/GHSA-xxjp-cjxr-2x6m
vendor-advisory, exploit, advisory
-
vulncheck.com
/advisories/frankenphp-before-1.13.0-cgi-path-split-boundary-bypass-via-splitpos
third-party-advisory
Sources
- CVE List CVE-2026-128025
- NVD CVE-2026-128025
- Maintainer advisory GHSA-xxjp-cjxr-2x6m
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.