CVE-2026-15341

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-15. 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 week
9.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 9.8Exploit: None knownExposed services: Not assessed

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

The User Session Synchronizer plugin for WordPress is vulnerable to Authentication Bypass leading to Account Takeover in all versions up to, and including, 1.4.0. The synchronize_session() function, hooked on init and therefore executed on every request, performs no nonce, capability, or shared-secret validation against the attacker-supplied ussync-key, ussync-token, and ussync-ref parameters; when ussync-key references an unregistered slot, get_option() returns false for both the secret key and the domain list, causing the AES-256-CBC encryption key to degrade to the fully predictable md5('') and the referer allowlist to collapse to an empty-string match, while the AES IV is unconditionally hard-coded as md5('another-secret'). This makes it possible for unauthenticated attackers to supply a crafted request encrypting any known or guessable user email address in the ussync-ref parameter, causing the handler to call wp_set_auth_cookie() for the matched user and granting full authentication as that user — including administrators — with no prior knowledge of site secrets.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
49
EG Risk 49/100CISA SSVC

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%
Exploitation1% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.6%
EPSS %ILE
46th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 15, 2026

Last Modified

August 20, 2026

References (7)

Vendor Advisories for CVE-2026-15341(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 34× in last 7d / 178× 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 341 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-15341?
CVE-2026-15341 is a critical vulnerability published on August 15, 2026. The User Session Synchronizer plugin for WordPress is vulnerable to Authentication Bypass leading to Account Takeover in all versions up to, and including, 1.4.0. The synchronizesession() function, hooked on init and therefore executed on every request, performs no nonce, capability, or…
When was CVE-2026-15341 disclosed?
CVE-2026-15341 was first published on August 15, 2026, with the most recent update on August 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15341 actively exploited?
CVE-2026-15341 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (46th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-15341?
CVE-2026-15341 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-15341?
No fix for CVE-2026-15341 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-15341 are linked in the Vendor Advisories panel on this page.

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