CVE-2026-18109

HIGHPre-NVD 7.27.2—
EchelonGraph scoreHIGH confidence

Score 7.2 from GitHub Security Advisory (severity: HIGH) published 2026-08-14. a secondary CVSS source baseline 7.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.2Exploit: None knownExposed: 0

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

The W3 Total Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Author Name in all versions up to, and including, 2.10.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This vulnerability is only exploitable when the Lazy Load Images feature of W3 Total Cache is enabled, as the unsafe re-emission occurs exclusively within the LazyLoad mutator's img tag rewriting step.

CVSS v3
7.2
EG Score
7.2(high)
EG Risk
48(Track)
EG Risk 48/100SSVC: 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
Severity72% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

August 14, 2026

Last Modified

August 14, 2026

References (8)

Vendor Advisories for CVE-2026-18109(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 29× in last 7d / 32× 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. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 20:51 UTCGHSA enrichment
  3. 2026-08-20 07:39 UTCGHSA enrichment
  4. 2026-08-19 18:26 UTCEG score recompute
  5. 2026-08-19 18:26 UTCGHSA enrichment
  6. 2026-08-19 17:03 UTCEPSS rescore
  7. 2026-08-19 04:52 UTCGHSA enrichment
  8. 2026-08-18 15:40 UTCEG score recompute
  9. 2026-08-18 15:40 UTCGHSA enrichment
  10. 2026-08-18 13:48 UTCEPSS rescore
  11. 2026-08-18 02:28 UTCEG score recompute
  12. 2026-08-18 02:28 UTCGHSA enrichment
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-17 13:16 UTCGHSA enrichment
  15. 2026-08-17 00:05 UTCEG score recompute
  16. 2026-08-17 00:05 UTCGHSA enrichment
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 10:52 UTCEG score recompute
  19. 2026-08-16 10:52 UTCGHSA enrichment
  20. 2026-08-16 02:14 UTCEPSS rescore
  21. 2026-08-15 21:41 UTCGHSA enrichment
  22. 2026-08-15 08:29 UTCEG score recompute
  23. 2026-08-15 08:29 UTCGHSA enrichment
  24. 2026-08-15 01:30 UTCEPSS rescore
  25. 2026-08-14 19:16 UTCGHSA enrichment
Show 7 more
  1. 2026-08-14 11:36 UTCEG score recompute
  2. 2026-08-14 11:36 UTCGHSA enrichment
  3. 2026-08-14 11:09 UTCEG score recompute
  4. 2026-08-14 11:09 UTCGHSA enrichment
  5. 2026-08-14 03:17 UTCEG score recompute
  6. 2026-08-14 02:54 UTCEG score recompute
  7. 2026-08-14 02:53 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18109?
CVE-2026-18109 is a high vulnerability published on August 14, 2026. The W3 Total Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Author Name in all versions up to, and including, 2.10.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts…
When was CVE-2026-18109 disclosed?
CVE-2026-18109 was first published in the National Vulnerability Database on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18109 actively exploited?
CVE-2026-18109 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 81.5% of all scored CVEs.
What is the CVSS score of CVE-2026-18109?
CVE-2026-18109 has a CVSS v3 base score of 7.2 (NVD).
How do I remediate CVE-2026-18109?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18109, 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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