CVE-2026-77788

MEDIUMPre-NVD 4.94.9—
EchelonGraph scoreHIGH confidence

Score 4.9 from GitHub Security Advisory published 2026-09-02. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 4.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
4.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.9Exploit: None knownExposed: 0

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

The Rank Math SEO WordPress plugin before 1.0.277 does not verify that the metadata row being updated belongs to the object the user was authorised against, allowing users with the Author role and above to overwrite arbitrary post and user metadata, including that belonging to higher-privileged users.

CVSS v3
4.9
EG Score
4.9(high)
EG Risk
22(Track)
EG Risk 22/100SSVC: 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
Severity49% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
9%
KEV
Not listed

Published

September 2, 2026

Last Modified

September 3, 2026

Advisory Details (1)

Auto-updated Sep 2, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Rank Math SEO < 1.0.277 – Author+ Arbitrary Post and User Metadata Overwrite via updateSchemas | CVE 2026-77788 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/c02511a0-9c8b-44cd-b25f-e95cf5f9fef3/

Vendor Advisories for CVE-2026-77788(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 / 52× 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 06:19 UTCEG score recompute
  3. 2026-09-20 06:19 UTCGHSA enrichment
  4. 2026-09-19 05:40 UTCEG score recompute
  5. 2026-09-19 05:40 UTCGHSA enrichment
  6. 2026-09-18 19:28 UTCEPSS rescore
  7. 2026-09-18 05:01 UTCEG score recompute
  8. 2026-09-18 05:01 UTCGHSA enrichment
  9. 2026-09-17 04:22 UTCEG score recompute
  10. 2026-09-17 04:22 UTCGHSA enrichment
  11. 2026-09-16 14:08 UTCEPSS rescore
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-16 03:43 UTCEG score recompute
  14. 2026-09-16 03:43 UTCGHSA enrichment
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-15 03:12 UTCEPSS rescore
  17. 2026-09-15 03:05 UTCGHSA enrichment
  18. 2026-09-14 02:27 UTCEG score recompute
  19. 2026-09-14 02:27 UTCGHSA enrichment
  20. 2026-09-13 01:49 UTCEG score recompute
  21. 2026-09-13 01:49 UTCGHSA enrichment
  22. 2026-09-12 01:11 UTCEG score recompute
  23. 2026-09-12 01:11 UTCGHSA enrichment
  24. 2026-09-11 14:53 UTCEPSS rescore
  25. 2026-09-11 00:32 UTCEG score recompute
Show 27 more
  1. 2026-09-11 00:32 UTCGHSA enrichment
  2. 2026-09-10 09:35 UTCEPSS rescore
  3. 2026-09-09 23:54 UTCGHSA enrichment
  4. 2026-09-08 23:15 UTCEG score recompute
  5. 2026-09-08 23:15 UTCGHSA enrichment
  6. 2026-09-08 22:01 UTCEPSS rescore
  7. 2026-09-07 20:38 UTCEG score recompute
  8. 2026-09-07 20:38 UTCGHSA enrichment
  9. 2026-09-06 20:00 UTCEG score recompute
  10. 2026-09-06 20:00 UTCGHSA enrichment
  11. 2026-09-06 13:48 UTCEPSS rescore
  12. 2026-09-05 19:21 UTCEG score recompute
  13. 2026-09-05 19:21 UTCGHSA enrichment
  14. 2026-09-04 18:43 UTCEG score recompute
  15. 2026-09-04 18:43 UTCGHSA enrichment
  16. 2026-09-04 05:07 UTCEPSS rescore
  17. 2026-09-03 18:04 UTCGHSA enrichment
  18. 2026-09-03 12:05 UTCEG score recompute
  19. 2026-09-03 12:04 UTCGHSA enrichment
  20. 2026-09-02 14:12 UTCEPSS rescore
  21. 2026-09-02 11:25 UTCGHSA enrichment
  22. 2026-09-02 10:52 UTCEG score recompute▲ 4.90
  23. 2026-09-02 10:51 UTCGHSA enrichment
  24. 2026-09-02 10:48 UTCMITRE cvelistV5CVSS v3 → 4.9 · severity → MEDIUM
  25. 2026-09-02 06:26 UTCNVD update
  26. 2026-09-02 06:07 UTCEG score recompute
  27. 2026-09-02 06:05 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-77788?
CVE-2026-77788 is a medium vulnerability published on September 2, 2026. The Rank Math SEO WordPress plugin before 1.0.277 does not verify that the metadata row being updated belongs to the object the user was authorised against, allowing users with the Author role and above to overwrite arbitrary post and user metadata, including that belonging to higher-privileged…
When was CVE-2026-77788 disclosed?
CVE-2026-77788 was first published in the National Vulnerability Database on September 2, 2026, with the most recent update on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77788 actively exploited?
CVE-2026-77788 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 90.7% of all scored CVEs.
What is the CVSS score of CVE-2026-77788?
CVE-2026-77788 has a CVSS v3.1 base score of 4.9 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-77788?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77788, 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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