CVE-2026-12255

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-07-27. 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 weekElevated
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: Elevated riskExposed: 0

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

The MainWP Child WordPress plugin before 6.1.2 does not verify the requester's identity in its site-registration request handler when password authentication has been disabled for the targeted account, allowing an unauthenticated attacker to obtain a valid authentication session as that account, including an administrator, by naming its login in a single registration request.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
52(Track*)
EG Risk 52/100SSVC: 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%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
20%
KEV
Not listed

Published

July 27, 2026

Last Modified

July 27, 2026

Advisory Details (1)

Auto-updated Jul 27, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

MainWP Child < 6.1.2 – Unauthenticated Administrator Authentication Bypass via Passwordless Site Registration | CVE 2026-12255 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/6ecd37bf-f48a-4f7f-8a93-e7f0475371af/

Vendor Advisories for CVE-2026-12255(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 22× in last 7d / 90× 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 176 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-12255?
CVE-2026-12255 is a high vulnerability published on July 27, 2026. The MainWP Child WordPress plugin before 6.1.2 does not verify the requester's identity in its site-registration request handler when password authentication has been disabled for the targeted account, allowing an unauthenticated attacker to obtain a valid authentication session as that account,…
When was CVE-2026-12255 disclosed?
CVE-2026-12255 was first published in the National Vulnerability Database on July 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12255 actively exploited?
CVE-2026-12255 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 80.2% of all scored CVEs.
What is the CVSS score of CVE-2026-12255?
CVE-2026-12255 has a CVSS v3.1 base score of 8.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-12255?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12255, 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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