CVE-2026-12255

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH 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 — 5 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(high)
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 21× in last 7d / 21× 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.

  1. 2026-07-31 08:27 UTCGHSA enrichment
  2. 2026-07-30 20:30 UTCEG score recompute
  3. 2026-07-30 20:30 UTCGHSA enrichment
  4. 2026-07-30 16:27 UTCEPSS rescore
  5. 2026-07-30 08:27 UTCEG score recompute
  6. 2026-07-30 08:27 UTCGHSA enrichment
  7. 2026-07-30 01:30 UTCEPSS rescore
  8. 2026-07-29 20:31 UTCGHSA enrichment
  9. 2026-07-29 08:33 UTCGHSA enrichment
  10. 2026-07-28 20:37 UTCEG score recompute
  11. 2026-07-28 20:37 UTCGHSA enrichment
  12. 2026-07-28 15:36 UTCEPSS rescore
  13. 2026-07-28 08:39 UTCGHSA enrichment
  14. 2026-07-27 20:42 UTCEG score recompute
  15. 2026-07-27 20:42 UTCGHSA enrichment
  16. 2026-07-27 16:17 UTCEG score recompute▲ 8.10
  17. 2026-07-27 16:16 UTCGHSA enrichment
  18. 2026-07-27 16:16 UTCMITRE cvelistV5CVSS v3 → 8.1 · severity → HIGH
  19. 2026-07-27 07:19 UTCNVD update
  20. 2026-07-27 06:24 UTCEG score recompute
  21. 2026-07-27 06:22 UTCMITRE cvelistV5first tracked

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 80.3% 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

Explore the affected products and dependency analysis for CVE-2026-12255

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