CVE-2026-12281

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-07-15. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: None knownExposed: 0

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

The Shibboleth WordPress plugin before 2.5.4 does not fail closed when its HTTP header identity mode is enabled without an anti-spoofing key, treating any request that carries identity headers as an authenticated session without verifying them. On a deployment where untrusted client headers reach the application, an unauthenticated attacker can log in with forged identity headers and, when automatic account creation and the default administrator role mapping are enabled, create and sign in as a new administrator. Exploitation requires the non-default HTTP header attribute mode, an empty or absent spoof key, automatic account creation enabled, and a deployment that does not strip untrusted client headers before they reach the application.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity81% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
31%
KEV
Not listed

Published

July 15, 2026

Last Modified

July 15, 2026

Advisory Details (1)

Auto-updated Jul 15, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Shibboleth < 2.5.4 – Unauthenticated Administrator Account Creation via Identity Header Spoofing | CVE 2026-12281 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/8474eda4-6385-447a-9139-f57c049d1713/

Vendor Advisories for CVE-2026-12281(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 21× in last 7d / 105× 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 144 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-12281?
CVE-2026-12281 is a high vulnerability published on July 15, 2026. The Shibboleth WordPress plugin before 2.5.4 does not fail closed when its HTTP header identity mode is enabled without an anti-spoofing key, treating any request that carries identity headers as an authenticated session without verifying them. On a deployment where untrusted client headers reach…
When was CVE-2026-12281 disclosed?
CVE-2026-12281 was first published in the National Vulnerability Database 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-2026-12281 actively exploited?
CVE-2026-12281 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 68.8% of all scored CVEs.
What is the CVSS score of CVE-2026-12281?
CVE-2026-12281 has a CVSS v3.1 base score of 8.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-12281?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12281, 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.

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