CVE-2026-84829

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-16. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
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.

The Optimole WordPress plugin before 4.2.12 does not properly escape a user supplied value before using it to build an image tag attribute, allowing unauthenticated users to inject arbitrary attributes into pages served to every visitor, which leads to Stored Cross-Site Scripting.

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 computed
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
40%
KEV
Not listed

Published

September 16, 2026

Last Modified

September 17, 2026

Advisory Details (1)

Auto-updated Sep 17, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Optimole < 4.2.12 – Unauthenticated Stored XSS via Srcset Descriptor Parameter | CVE 2026-84829 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/c8489eb1-e767-4b19-a7c0-124eab843d9e/

Vendor Advisories for CVE-2026-84829(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 28× in last 7d / 41× 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. 2026-09-25 04:08 UTCGHSA enrichment
  2. 2026-09-24 16:42 UTCEG score recompute
  3. 2026-09-24 16:42 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 05:17 UTCEG score recompute
  6. 2026-09-24 05:17 UTCGHSA enrichment
  7. 2026-09-23 17:54 UTCEPSS rescore
  8. 2026-09-23 17:52 UTCGHSA enrichment
  9. 2026-09-23 06:27 UTCGHSA enrichment
  10. 2026-09-22 19:02 UTCEG score recompute
  11. 2026-09-22 19:02 UTCGHSA enrichment
  12. 2026-09-22 16:01 UTCEPSS rescore
  13. 2026-09-22 07:37 UTCEG score recompute
  14. 2026-09-22 07:37 UTCGHSA enrichment
  15. 2026-09-21 21:09 UTCEPSS rescore
  16. 2026-09-21 20:12 UTCGHSA enrichment
  17. 2026-09-21 08:47 UTCGHSA enrichment
  18. 2026-09-20 21:22 UTCEG score recompute
  19. 2026-09-20 21:21 UTCGHSA enrichment
  20. 2026-09-20 20:16 UTCEPSS rescore
  21. 2026-09-20 09:54 UTCGHSA enrichment
  22. 2026-09-19 22:29 UTCEG score recompute
  23. 2026-09-19 22:29 UTCGHSA enrichment
  24. 2026-09-19 11:04 UTCGHSA enrichment
  25. 2026-09-18 23:39 UTCEG score recompute
Show 16 more
  1. 2026-09-18 23:39 UTCGHSA enrichment
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 12:14 UTCGHSA enrichment
  4. 2026-09-18 00:48 UTCEG score recompute
  5. 2026-09-18 00:48 UTCGHSA enrichment
  6. 2026-09-17 19:32 UTCEPSS rescore
  7. 2026-09-17 13:23 UTCGHSA enrichment
  8. 2026-09-17 12:56 UTCEG score recompute▲ 8.80
  9. 2026-09-17 12:56 UTCGHSA enrichment
  10. 2026-09-17 12:54 UTCMITRE cvelistV5CVSS v3 → 8.8 · severity → HIGH
  11. 2026-09-16 21:01 UTCEG score recompute
  12. 2026-09-16 21:01 UTCGHSA enrichment
  13. 2026-09-16 14:09 UTCEPSS rescore
  14. 2026-09-16 06:21 UTCNVD update
  15. 2026-09-16 06:03 UTCEG score recompute
  16. 2026-09-16 06:02 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-84829?
CVE-2026-84829 is a high vulnerability published on September 16, 2026. The Optimole WordPress plugin before 4.2.12 does not properly escape a user supplied value before using it to build an image tag attribute, allowing unauthenticated users to inject arbitrary attributes into pages served to every visitor, which leads to Stored Cross-Site Scripting.
When was CVE-2026-84829 disclosed?
CVE-2026-84829 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-2026-84829 actively exploited?
CVE-2026-84829 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 59.5% of all scored CVEs.
What is the CVSS score of CVE-2026-84829?
CVE-2026-84829 has a CVSS v3.1 base score of 8.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-84829?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-84829, 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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