Symfony: Identity Spoofing via Unanchored DN Regex in X509Authenticator
Priority MEDIUM 41CWE-290Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-290.
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00343 27th percentileScored 2026-11-07
Fix Fixed symfony (symfony): 5.4.52, 6.4.40, 7.4.12 +1symfony/security-http (Packagist): 5.4.52, 6.4.40, 7.4.12 +1+1 more product
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- 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 |
|---|---|---|---|---|---|
| symfony | symfony | before 5.4.52; 6.0.0-BETA1 to before 6.4.40; 7.0.0-BETA1 to before 7.4.12; 8.0.0-BETA1 to before 8.0.12 | 5.4.52, 6.4.40, 7.4.12, 8.0.12 | Patch available | CNA |
| — | symfony/security-http (Packagist) | before 5.4.52 | 5.4.52 | Patch available | GHSA-ph86-p8f6-f9r2 |
| — | symfony/security-http (Packagist) | 6.0.0-BETA1 to before 6.4.40 | 6.4.40 | Patch available | GHSA-ph86-p8f6-f9r2 |
| — | symfony/security-http (Packagist) | 7.0.0-BETA1 to before 7.4.12 | 7.4.12 | Patch available | GHSA-ph86-p8f6-f9r2 |
| — | symfony/security-http (Packagist) | 8.0.0-BETA1 to before 8.0.12 | 8.0.12 | Patch available | GHSA-ph86-p8f6-f9r2 |
| — | symfony/symfony (Packagist) | before 5.4.52 | 5.4.52 | Patch available | GHSA-ph86-p8f6-f9r2 |
| — | symfony/symfony (Packagist) | 6.0.0-BETA1 to before 6.4.40 | 6.4.40 | Patch available | GHSA-ph86-p8f6-f9r2 |
| — | symfony/symfony (Packagist) | 7.0.0-BETA1 to before 7.4.12 | 7.4.12 | Patch available | GHSA-ph86-p8f6-f9r2 |
| — | symfony/symfony (Packagist) | 8.0.0-BETA1 to before 8.0.12 | 8.0.12 | Patch available | GHSA-ph86-p8f6-f9r2 |
- symfony Vendorsymfony Affected before 5.4.52; 6.0.0-BETA1 to before 6.4.40; 7.0.0-BETA1 to before 7.4.12; 8.0.0-BETA1 to before 8.0.12 Fixed in 5.4.52, 6.4.40, 7.4.12, 8.0.12 Patch available CNA
- symfony/security-http (Packagist) Vendor— Affected before 5.4.52 Fixed in 5.4.52 Patch available GHSA-ph86-p8f6-f9r2
- symfony/security-http (Packagist) Vendor— Affected 6.0.0-BETA1 to before 6.4.40 Fixed in 6.4.40 Patch available GHSA-ph86-p8f6-f9r2
- symfony/security-http (Packagist) Vendor— Affected 7.0.0-BETA1 to before 7.4.12 Fixed in 7.4.12 Patch available GHSA-ph86-p8f6-f9r2
- symfony/security-http (Packagist) Vendor— Affected 8.0.0-BETA1 to before 8.0.12 Fixed in 8.0.12 Patch available GHSA-ph86-p8f6-f9r2
- symfony/symfony (Packagist) Vendor— Affected before 5.4.52 Fixed in 5.4.52 Patch available GHSA-ph86-p8f6-f9r2
- symfony/symfony (Packagist) Vendor— Affected 6.0.0-BETA1 to before 6.4.40 Fixed in 6.4.40 Patch available GHSA-ph86-p8f6-f9r2
- symfony/symfony (Packagist) Vendor— Affected 7.0.0-BETA1 to before 7.4.12 Fixed in 7.4.12 Patch available GHSA-ph86-p8f6-f9r2
- symfony/symfony (Packagist) Vendor— Affected 8.0.0-BETA1 to before 8.0.12 Fixed in 8.0.12 Patch available GHSA-ph86-p8f6-f9r2
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:* | before 5.4.52; 6.0.0 to before 6.4.40; 7.0.0 to before 7.4.12; 8.0.0 to before 8.0.12 | Vulnerable | sensiolabs |
- cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:* Versions before 5.4.52; 6.0.0 to before 6.4.40; 7.0.0 to before 7.4.12; 8.0.0 to before 8.0.12 Vulnerable ·sensiolabs
Remediation
- Fix · CNA symfony (symfony) Fixed in 5.4.52, 6.4.40, 7.4.12, 8.0.12
- Fix · GHSA-ph86-p8f6-f9r2 symfony/security-http (Packagist) Fixed in 5.4.52 Advisory →
- Fix · GHSA-ph86-p8f6-f9r2 symfony/security-http (Packagist) Fixed in 6.4.40 Advisory →
- Fix · GHSA-ph86-p8f6-f9r2 symfony/security-http (Packagist) Fixed in 7.4.12 Advisory →
- Fix · GHSA-ph86-p8f6-f9r2 symfony/security-http (Packagist) Fixed in 8.0.12 Advisory →
- Fix · GHSA-ph86-p8f6-f9r2 symfony/symfony (Packagist) Fixed in 5.4.52 Advisory →
- Fix · GHSA-ph86-p8f6-f9r2 symfony/symfony (Packagist) Fixed in 6.4.40 Advisory →
- Fix · GHSA-ph86-p8f6-f9r2 symfony/symfony (Packagist) Fixed in 7.4.12 Advisory →
- Fix · GHSA-ph86-p8f6-f9r2 symfony/symfony (Packagist) Fixed in 8.0.12 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-45063
- 2026-10-03 Alias added: GHSA-ph86-p8f6-f9r2
References
Patch 2
Other 9
- https://github.com/symfony/symfony/releases/tag/v5.4.52
- https://github.com/symfony/symfony/releases/tag/v6.4.40
- https://github.com/symfony/symfony/releases/tag/v7.4.12
- https://github.com/symfony/symfony/releases/tag/v8.0.12
- https://github.com/symfony/symfony/commit/ccb3f724c7ff55670a6fe3521c7bf1514cceb478
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-http/CVE-2026-45063.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-45063.yaml
- https://github.com/symfony/symfony
- https://symfony.com/cve-2026-45063
More symfony vulnerabilities
- TI-2024-33775 Ability to change environment from query in symfony/runtime CVSS 3.1HIGH 7.3
- TI-2026-34283 Twig: The `spaceless` filter implicitly marks its output as safe CVSS 4.0MEDIUM 5.1
- TI-2022-07667 Code injection in Twig CVSS 3.1CRITICAL 9.8
- TI-2018-10028 Twig before 2.4.4 allows Server-Side Template Injection (SSTI) via the search search_key… CVSS 3.0CRITICAL 9.8
- TI-2026-35851 Incorrect authorization in symfony CVSS 4.0HIGH 8.7
- TI-2026-35264 Improper input validation in symfony CVSS 4.0HIGH 8.3
Sources
- CVE-2026-45063 · CVE Program
- CVE-2026-45063 · NVD
- FIRST EPSS
- GHSA-ph86-p8f6-f9r2 · GitHub Advisory Database · CC BY 4.0
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