CVE-2026-45063

CRITICALNVD 9.19.1
EchelonGraph scoreLOW confidence

This critical-severity CVE scores 9.1 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.1%, top 79% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: cna:github_m, epss
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.1
EG Score
9.1(low)
EG Risk
—
EPSS
24.6%
KEV
Not listed

Published

May 27, 2026

Last Modified

July 15, 2026

Advisory Details (6)

Auto-updated Jul 14, 2026
Patch available. Sources: github_release, github, github_commit.
github Patch Available

Identity Spoofing via Unanchored DN Regex in X509Authenticator · Advisory · symfony/symfony · GitHub

https://github.com/symfony/symfony/security/advisories/GHSA-ph86-p8f6-f9r2
github_release Patch Available

v8.0.12

Patch available: symfony/symfony v8.0.12

https://github.com/symfony/symfony/releases/tag/v8.0.12
github_release Patch Available

v7.4.12

Patch available: symfony/symfony v7.4.12

https://github.com/symfony/symfony/releases/tag/v7.4.12
github_release Patch Available

v6.4.40

Patch available: symfony/symfony v6.4.40

https://github.com/symfony/symfony/releases/tag/v6.4.40
github_release Patch Available

v5.4.52

Patch available: symfony/symfony v5.4.52

https://github.com/symfony/symfony/releases/tag/v5.4.52
github_commit

commit 59ef48402960 (symfony/symfony)

Fix landed in symfony/symfony commit 59ef48402960 — awaiting tagged release

https://github.com/symfony/symfony/commit/59ef484029601a7af06f5e06c6ed921fdcea5a0d

Vendor Advisories for CVE-2026-45063(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(2 across 1 ecosystem)
Packagist(2)
PackageVulnerable rangeFixed inDependents
symfony/security-httpv8.0.0 ... v8.0.9 (11 versions)8.0.12—
symfony/symfonyv8.0.0 ... v8.0.9 (17 versions)8.0.12—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 9× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-20 17:08 UTCEPSS rescore
  3. 2026-07-19 14:31 UTCEPSS rescore
  4. 2026-07-19 02:29 UTCEPSS rescore
  5. 2026-07-18 10:04 UTCEPSS rescore
  6. 2026-07-16 17:03 UTCEPSS rescore
  7. 2026-07-15 16:57 UTCEPSS rescore
  8. 2026-07-14 18:35 UTCEG score recompute▲ 9.10
  9. 2026-07-14 18:35 UTCMITRE cvelistV5CVSS v3 → 9.1 · CVSS v4 → 9.1 · severity → CRITICAL
  10. 2026-06-14 23:18 UTCEPSS rescore
  11. 2026-06-13 23:00 UTCEPSS rescore
  12. 2026-06-12 23:12 UTCEPSS rescore
  13. 2026-05-27 17:35 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-45063?
CVE-2026-45063 is a critical vulnerability published on May 27, 2026. 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['SSLCLIENTSDN'] with an unanchored regex that matches emailAddress= anywhere in the…
When was CVE-2026-45063 disclosed?
CVE-2026-45063 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45063 actively exploited?
CVE-2026-45063 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 24.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45063?
CVE-2026-45063 has a CVSS v3 base score of 9.1 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-45063?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45063, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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