The Mang Board WP plugin for WordPress is vulnerable to Missing Authorization via Authentication Cookie Forgery in all versions up to, and including, 2.3.7. This is due to flawed HMAC generation in the mbw_get_hash_key() function that uses the current user's identity instead of the cookie username parameter when a WordPress user is logged in, combined with insufficient validation in mbw_validate_auth_cookie(). This makes it possible for authenticated attackers, with subscriber-level access and above, to forge administrator authentication cookies and change administrator passwords to achieve complete site takeover.
CVE-2026-75977
HIGHPre-NVD 8.88.8—Trending — 4 sources updated this week
EchelonGraph scoreHIGH confidence
Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-26. a secondary CVSS source baseline 8.8; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 8.8
- EG Score
- 8.8(high)
- EG Risk
- 40(Track)EG Risk 40/100SSVC: 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 computedSeverity88% × 45%Exploitation1% × 40%Automatability0% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 1%
- EPSS %ILE
- 47%
- KEV
- Not listed
Published
August 26, 2026
Last Modified
August 26, 2026
References (12)
- security@wordfencehttps://plugins.trac.wordpress.org/browser/mangboard/tags/2.3.5/api/mb-template.php#L36
- security@wordfencehttps://plugins.trac.wordpress.org/browser/mangboard/tags/2.3.5/includes/functions/func.board.php#L1581
- security@wordfencehttps://plugins.trac.wordpress.org/browser/mangboard/tags/2.3.5/includes/functions/func.board.php#L32
- security@wordfencehttps://plugins.trac.wordpress.org/browser/mangboard/tags/2.3.5/includes/functions/func.user.php#L447
- security@wordfencehttps://plugins.trac.wordpress.org/browser/mangboard/tags/2.3.5/models/admin/users.php#L125
- security@wordfencehttps://plugins.trac.wordpress.org/browser/mangboard/tags/2.3.6/api/mb-template.php#L36
- security@wordfencehttps://plugins.trac.wordpress.org/browser/mangboard/tags/2.3.6/includes/functions/func.board.php#L1581
- security@wordfencehttps://plugins.trac.wordpress.org/browser/mangboard/tags/2.3.6/includes/functions/func.board.php#L32
- security@wordfencehttps://plugins.trac.wordpress.org/browser/mangboard/tags/2.3.6/includes/functions/func.user.php#L447
- security@wordfencehttps://plugins.trac.wordpress.org/browser/mangboard/tags/2.3.6/models/admin/users.php#L125
- security@wordfencehttps://plugins.trac.wordpress.org/changeset/3664567/
- security@wordfencehttps://www.wordfence.com/threat-intel/vulnerabilities/id/ae75196d-2128-4da8-a90b-a62454dcdbe9?source=cve
Vendor Advisories for CVE-2026-75977(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 19× in last 7d / 19× 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.
- 2026-08-30 04:23 UTCEG score recompute
- 2026-08-30 04:23 UTCGHSA enrichment
- 2026-08-30 01:22 UTCEPSS rescore
- 2026-08-29 16:24 UTCGHSA enrichment
- 2026-08-29 04:24 UTCEG score recompute
- 2026-08-29 04:23 UTCGHSA enrichment
- 2026-08-28 21:42 UTCEPSS rescore
- 2026-08-28 16:26 UTCGHSA enrichment
- 2026-08-28 04:27 UTCGHSA enrichment
- 2026-08-27 16:31 UTCEG score recompute
- 2026-08-27 16:31 UTCGHSA enrichment
- 2026-08-27 14:25 UTCEPSS rescore
- 2026-08-27 04:34 UTCEG score recompute
- 2026-08-27 04:34 UTCGHSA enrichment
- 2026-08-26 15:54 UTCEG score recompute
- 2026-08-26 14:47 UTCEPSS rescore
- 2026-08-26 14:08 UTCEG score recompute
- 2026-08-26 07:59 UTCEG score recompute
- 2026-08-26 07:58 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Same CWE
10 shownCWE-269
Frequently asked(5)
What is CVE-2026-75977?
CVE-2026-75977 is a high vulnerability published on August 26, 2026. The Mang Board WP plugin for WordPress is vulnerable to Missing Authorization via Authentication Cookie Forgery in all versions up to, and including, 2.3.7. This is due to flawed HMAC generation in the mbwgethashkey() function that uses the current user's identity instead of the cookie username…
When was CVE-2026-75977 disclosed?
CVE-2026-75977 was first published in the National Vulnerability Database on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-75977 actively exploited?
CVE-2026-75977 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 52.9% of all scored CVEs.
What is the CVSS score of CVE-2026-75977?
CVE-2026-75977 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-75977?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-75977, 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-2026-75977
Is Your Infrastructure Affected by CVE-2026-75977?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.