CVE-2026-89029

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreHIGH confidence

Score 4.3 from GitHub Security Advisory published 2026-09-16. a secondary CVSS source baseline 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: None knownExposed: 0

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

Adenion Blog2Social plugin for WordPress before 9.1.0 allows low-privileged users to enumerate WordPress user accounts. The b2s_get_select_mandant_user AJAX handler in includes/Ajax/Get.php resolves arbitrary user IDs supplied in the owner parameter to display names without verifying that the caller is authorized to read user account data, allowing any user with the edit_posts capability to map WordPress user IDs to display names and confirm account existence for arbitrary IDs.

CVSS v3
4.3
EG Score
4.3(high)
EG Risk
19(Track)
EG Risk 19/100SSVC: 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
Severity43% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

September 16, 2026

Last Modified

September 17, 2026

Advisory Details (2)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic

Blog2Social WordPress Plugin < 9.1.0 User Enumeration via AJAX Handler | Advisories | VulnCheck

https://www.vulncheck.com/advisories/blog2social-wordpress-plugin-user-enumeration-via-ajax-handler
generic

Blog2Social: Social Media Auto Post & Scheduler – WordPress plugin | WordPress.org

https://wordpress.org/plugins/blog2social/#developers

Vendor Advisories for CVE-2026-89029(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 17× in last 7d / 17× 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. 2026-09-20 20:16 UTCEPSS rescore
  2. 2026-09-20 20:12 UTCGHSA enrichment
  3. 2026-09-19 20:25 UTCEG score recompute
  4. 2026-09-19 20:25 UTCGHSA enrichment
  5. 2026-09-18 20:37 UTCEG score recompute
  6. 2026-09-18 20:37 UTCGHSA enrichment
  7. 2026-09-18 19:28 UTCEPSS rescore
  8. 2026-09-17 20:28 UTCEG score recompute
  9. 2026-09-17 20:28 UTCGHSA enrichment
  10. 2026-09-17 19:32 UTCEPSS rescore
  11. 2026-09-17 19:31 UTCEG score recompute
  12. 2026-09-17 19:31 UTCGHSA enrichment
  13. 2026-09-17 14:12 UTCEG score recompute
  14. 2026-09-17 14:11 UTCGHSA enrichment
  15. 2026-09-16 14:23 UTCEG score recompute
  16. 2026-09-16 14:06 UTCEG score recompute
  17. 2026-09-16 14:05 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-89029?
CVE-2026-89029 is a medium vulnerability published on September 16, 2026. Adenion Blog2Social plugin for WordPress before 9.1.0 allows low-privileged users to enumerate WordPress user accounts. The b2sgetselectmandantuser AJAX handler in includes/Ajax/Get.php resolves arbitrary user IDs supplied in the owner parameter to display names without verifying that the caller is…
When was CVE-2026-89029 disclosed?
CVE-2026-89029 was first published in the National Vulnerability Database on September 16, 2026, with the most recent update on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-89029 actively exploited?
CVE-2026-89029 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 80.7% of all scored CVEs.
What is the CVSS score of CVE-2026-89029?
CVE-2026-89029 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-89029?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-89029, 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-2026-89029

Explore →

Is Your Infrastructure Affected by CVE-2026-89029?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs