CVE-2026-45063 json
Symfony: Identity Spoofing via Unanchored DN Regex in X509Authenticator
published 2026-05-27 5 mo ago modified 2026-09-10 1 mo ago also GHSA-ph86-p8f6-f9r2 , EUVD-2026-44347
- cvss
- 9.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 28%
- public exploits
- 0
- none known
Summary
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, X509Authenticator extracts the user identifier from $_SERVER['SSL_CLIENT_S_DN'] with an unanchored regex that matches emailAddress= anywhere in the distinguished name, allowing an attacker with a trusted certificate containing emailAddress=victim inside another RDN value such as CN to authenticate as the victim. This issue is fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.
Patch / fix
- packagist symfony/security-http 5.4.52, 6.4.40, 7.4.12, 8.0.12
- packagist symfony/symfony 5.4.52, 6.4.40, 7.4.12, 8.0.12
- sensiolabs symfony 5.4.52, 6.4.40, 7.4.12, 8.0.12
- symfony Debian 12 5.4.53+dfsg-0+deb12u1
- symfony Debian 13 6.4.41+dfsg-0+deb13u1
- symfony Debian 14 7.4.12+dfsg-1
debian advisories DEBIAN-CVE-2026-45063
- github.com/symfony/symfony@59ef484 commit
- github.com/symfony/symfony@ccb3f72 commit
- github.com/symfony/symfony/releases/tag/v5.4.52 release
- github.com/symfony/symfony/releases/tag/v6.4.40 release
- github.com/symfony/symfony/releases/tag/v7.4.12 release
- github.com/symfony/symfony/releases/tag/v8.0.12 release
- github.com/symfony/symfony/security/advisories/GHSA-ph86-p8f6-f9r2 advisory
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 3 mo ago
Exploit prediction
0.34% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).
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 | 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 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | symfony/security-http | <5.4.52 >=6.0.0-BETA1, <6.4.40 >=7.0.0-BETA1, <7.4.12 >=8.0.0-BETA1, <8.0.12 |
5.4.52 6.4.40 7.4.12 8.0.12 |
| packagist | symfony/symfony | <5.4.52 >=6.0.0-BETA1, <6.4.40 >=7.0.0-BETA1, <7.4.12 >=8.0.0-BETA1, <8.0.12 |
5.4.52 6.4.40 7.4.12 8.0.12 |
Affected products
- symfony symfony
Classification
- Weakness
-
- CWE-290 Authentication Bypass by Spoofing
References
-
github.com
/symfony/symfony/commit/59ef484029601a7af06f5e06c6ed921fdcea5a0d
patch
-
github.com
/symfony/symfony/security/advisories/GHSA-ph86-p8f6-f9r2
web, patch, vendor-advisory
-
github.com
/symfony/symfony/commit/ccb3f724c7ff55670a6fe3521c7bf1514cceb478
web
-
github.com
/symfony/symfony/releases/tag/v5.4.52
product, release-notes
-
github.com
/symfony/symfony/releases/tag/v6.4.40
product, release-notes
-
github.com
/symfony/symfony/releases/tag/v7.4.12
product, release-notes
-
github.com
/symfony/symfony/releases/tag/v8.0.12
product, release-notes
-
github.com
/FriendsOfPHP/security-advisories/blob/master/symfony/security-http/CVE-2026-45063.yaml
web
-
github.com
/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-45063.yaml
web
-
github.com
/symfony/symfony
package
-
symfony.com
/cve-2026-45063
web
Sources
- CVE List CVE-2026-45063
- GitHub Advisory GHSA-ph86-p8f6-f9r2
- NVD CVE-2026-45063
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