CVE-2026-15013

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-16. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

The SAML Single Sign On – SSO Login plugin for WordPress is vulnerable to Authentication Bypass via SAML Signature Algorithm Confusion in all versions up to, and including, 5.4.3. The vulnerability exists because Mo_SAML_Utilities::mo_saml_cast_key() reads the SignatureMethod Algorithm attribute directly from the attacker-controlled SAMLResponse parameter rather than enforcing the locally configured algorithm, causing the plugin to recast the IdP's RSA public key as an HMAC-SHA1 shared secret and validate the forged signature against it. This makes it possible for unauthenticated attackers to forge a SAML assertion targeting any WordPress account — including administrators — obtain valid WordPress authentication cookies, and achieve full administrator-level account takeover.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Track)
EG Risk 75/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
73%
KEV
Not listed

Published

July 16, 2026

Last Modified

August 7, 2026

Advisory Details (1)

Auto-updated Sep 11, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Full Disclosure: CVE-2026-15013 – miniOrange SAML SSO <= 5.4.3 Unauthenticated Authentication Bypass (PoC)

http://seclists.org/fulldisclosure/2026/Aug/33

Vendor Advisories for CVE-2026-15013(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 136× 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.

Showing the most recent 100 of 293 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-52668
    First seen Sep 1, 2026

    miniOrange 5.4.3 - Unauthenticated Auth Bypass

    Open source ↗

Frequently asked(5)

What is CVE-2026-15013?
CVE-2026-15013 is a critical vulnerability published on July 16, 2026. The SAML Single Sign On – SSO Login plugin for WordPress is vulnerable to Authentication Bypass via SAML Signature Algorithm Confusion in all versions up to, and including, 5.4.3. The vulnerability exists because MoSAMLUtilities::mosamlcast_key() reads the SignatureMethod Algorithm attribute…
When was CVE-2026-15013 disclosed?
CVE-2026-15013 was first published in the National Vulnerability Database on July 16, 2026, with the most recent update on August 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15013 actively exploited?
CVE-2026-15013 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 27.2% of all scored CVEs.
What is the CVSS score of CVE-2026-15013?
CVE-2026-15013 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-15013?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15013, 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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