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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-45063

39
FAUCET Score

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.

First published: Jul 14, 2026Last modified: Jul 14, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 5.4.52CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
>= 6.0.0, < 6.4.40CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
>= 7.0.0, < 7.4.12CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
>= 8.0.0, < 8.0.12CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

9.1CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
HIGH
VS Integrity
HIGH
VS Availability
NONE
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.33%
Probability of exploitation in next 30 days
EPSS Percentile
25.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0033 is in the 4th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (8)

composerpatch availablevia ghsa
Product: symfony/security-httpFixed in: 5.4.52
composerpatch availablevia ghsa
Product: symfony/security-httpFixed in: 6.4.40
composerpatch availablevia ghsa
Product: symfony/security-httpFixed in: 7.4.12
composerpatch availablevia ghsa
Product: symfony/security-httpFixed in: 8.0.12
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 5.4.52
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 6.4.40
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 7.4.12
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 8.0.12

Vendor Advisories (1)

composerGHSA-ph86-p8f6-f9r2high

Symfony Vulnerable to Identity Spoofing via Unanchored DN Regex in X509Authenticator

May 27, 2026

References

github.com / symfony/symfony/commit/59ef484029601a7af06f5e06c6ed921fdcea5a0d
Patch
github.com / symfony/symfony/releases/tag/v5.4.52
ProductRelease Notes
github.com / symfony/symfony/releases/tag/v6.4.40
ProductRelease Notes
github.com / symfony/symfony/releases/tag/v7.4.12
ProductRelease Notes
github.com / symfony/symfony/releases/tag/v8.0.12
ProductRelease Notes
github.com / symfony/symfony/security/advisories/GHSA-ph86-p8f6-f9r2
PatchVendor Advisory