CVE-2026-45063

CRITICALNVD 9.19.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 0.4% (30th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3

Also known asEUVD-2026-44347 (ENISA EUVD) · GHSA-ph86-p8f6-f9r2 (GitHub Security Advisories)Source: ENISA EUVD

9.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
9.1CRITICALmedium confidence
EG Risk
41
EG Risk 41/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity91% × 45%
Impact severity (EG Severity): CVSS 9.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
30th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.1): severity, escalated by confirmed exploitation. This CVE's 9.1 is its impact severity (EG Severity), not escalated.

EG Severity
9.1 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-29). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

May 27, 2026

Last Modified

July 15, 2026

Advisory Details (6)

Auto-updated Sep 16, 2026
Patch available. Sources: github_commit, github_release, github.
GitHub advisoryMentions a patch (unverified)

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

(6 across 5 ecosystems)
Packagist(2)
PackageVulnerable rangeFix by version rangeDependents
symfony/security-httpv8.0.0 ... v8.0.9 (11 versions)
  • every version up to 5.4.52: fixed in 5.4.52
  • 6.0.0-BETA1 up to 6.4.40: fixed in 6.4.40
  • 7.0.0-BETA1 up to 7.4.12: fixed in 7.4.12
  • 8.0.0-BETA1 up to 8.0.12: fixed in 8.0.12
—
symfony/symfonyv8.0.0 ... v8.0.9 (17 versions)
  • every version up to 5.4.52: fixed in 5.4.52
  • 6.0.0-BETA1 up to 6.4.40: fixed in 6.4.40
  • 7.0.0-BETA1 up to 7.4.12: fixed in 7.4.12
  • 8.0.0-BETA1 up to 8.0.12: fixed in 8.0.12
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
symfony4.4.19+dfsg-2 ... 8.1.3+dfsg-1 (200 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
symfony5.4.23+dfsg-1 ... 5.4.52+dfsg-0+deb12u1 (22 versions)
  • every version up to 5.4.53+dfsg-0+deb12u1: fixed in 5.4.53+dfsg-0+deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
symfony6.4.21+dfsg-2, 6.4.21+dfsg-2+deb13u1, 6.4.24+dfsg-1, 6.4.25+dfsg-1, 6.4.40+dfsg-0+deb13u1
  • every version up to 6.4.41+dfsg-0+deb13u1: fixed in 6.4.41+dfsg-0+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
symfony6.4.21+dfsg-2 ... 7.4.9+dfsg-1 (52 versions)
  • every version up to 7.4.12+dfsg-1: fixed in 7.4.12+dfsg-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 53× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 148 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 48 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  2. 2026-10-29 16:38 UTCEG score recompute
  3. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  4. 2026-10-28 18:14 UTCEG score recompute
  5. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  6. 2026-10-27 19:44 UTCEG score recompute
  7. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  8. 2026-10-26 21:20 UTCEG score recompute
  9. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  10. 2026-10-25 20:47 UTCEG score recompute
  11. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  12. 2026-10-25 14:27 UTCEG score recompute
  13. 2026-10-24 22:23 UTCEG score recompute
  14. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  15. 2026-10-23 23:58 UTCEG score recompute
  16. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  17. 2026-10-23 01:33 UTCEG score recompute
  18. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  19. 2026-10-22 03:07 UTCEG score recompute
  20. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  21. 2026-10-21 04:41 UTCEG score recompute
  22. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  23. 2026-10-20 06:14 UTCEG score recompute
  24. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  25. 2026-10-19 07:47 UTCEG score recompute
Show 75 more
  1. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  2. 2026-10-18 03:38 UTCEG score recompute
  3. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  4. 2026-10-17 06:18 UTCEG score recompute
  5. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  6. 2026-10-16 07:35 UTCEG score recompute
  7. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  8. 2026-10-15 06:29 UTCEG score recompute
  9. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  10. 2026-10-14 02:09 UTCEG score recompute
  11. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  12. 2026-10-12 22:30 UTCEG score recompute
  13. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  14. 2026-10-12 16:04 UTCEG score recompute
  15. 2026-10-11 19:47 UTCEG score recompute
  16. 2026-10-11 17:01 UTCEG score recompute
  17. 2026-10-11 14:26 UTCEG score recompute
  18. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  19. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  20. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  21. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  22. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  23. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  24. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  25. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  26. 2026-10-03 16:49 UTCOSV refresh
  27. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  28. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  29. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  30. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  31. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  32. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  33. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  34. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  35. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  36. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  37. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  38. 2026-09-14 07:38 UTCEG score recompute
  39. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  40. 2026-09-13 03:09 UTCOSV refresh
  41. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  42. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  43. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  44. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  45. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  46. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  47. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  48. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  49. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  50. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  51. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  52. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  53. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  54. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  55. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  56. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  57. 2026-08-25 05:15 UTCEG score recompute
  58. 2026-08-23 14:59 UTCEG score recompute
  59. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  60. 2026-08-22 00:39 UTCEG score recompute
  61. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  62. 2026-08-21 01:40 UTCEG score recompute
  63. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  64. 2026-08-20 11:17 UTCEG score recompute
  65. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  66. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  67. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  68. 2026-08-16 15:14 UTCEG score recompute
  69. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  70. 2026-08-16 02:48 UTCEG score recompute
  71. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  72. 2026-08-15 01:58 UTCEG score recompute
  73. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  74. 2026-08-14 01:25 UTCEG score recompute
  75. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 25th percentile

Frequently asked(5)

What is CVE-2026-45063?
CVE-2026-45063 is a critical-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-45063 published?
The CVE record for CVE-2026-45063 was published on May 27, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 15, 2026; the record at its source may have been updated since.
Is CVE-2026-45063 actively exploited?
CVE-2026-45063 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (30th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-45063?
CVE-2026-45063 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-45063?
A fix for CVE-2026-45063 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-45063 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-45063

Explore →

Is Your Infrastructure Affected by CVE-2026-45063?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.