CVE-2026-78438

HIGHPre-NVD 7.27.2—
EchelonGraph scoreHIGH confidence

Score 7.2 from GitHub Security Advisory (severity: HIGH) published 2026-09-05. 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 Content via LazyLoad Background Mutator in all versions up to, and including, 2.10.5 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 requires the "Lazy Load Images" feature with "Process background images" to be enabled, and the malicious comment to be approved by a moderator before execution is triggered.

CVSS v3
7.2
EG Score
7.2(high)
EG Risk
33(Track)
EG Risk 33/100SSVC: 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%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
40%
KEV
Not listed

Published

September 5, 2026

Last Modified

September 8, 2026

References (8)

Vendor Advisories for CVE-2026-78438(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 26× in last 7d / 77× 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. 2026-09-24 23:15 UTCEG score recompute
  2. 2026-09-24 23:15 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-24 10:28 UTCGHSA enrichment
  5. 2026-09-23 21:48 UTCEG score recompute
  6. 2026-09-23 21:48 UTCGHSA enrichment
  7. 2026-09-23 17:54 UTCEPSS rescore
  8. 2026-09-23 09:08 UTCGHSA enrichment
  9. 2026-09-22 20:27 UTCEG score recompute
  10. 2026-09-22 20:27 UTCGHSA enrichment
  11. 2026-09-22 16:01 UTCEPSS rescore
  12. 2026-09-22 07:48 UTCEG score recompute
  13. 2026-09-22 07:48 UTCGHSA enrichment
  14. 2026-09-21 21:09 UTCEPSS rescore
  15. 2026-09-21 19:07 UTCGHSA enrichment
  16. 2026-09-21 06:27 UTCEG score recompute
  17. 2026-09-21 06:27 UTCGHSA enrichment
  18. 2026-09-20 20:16 UTCEPSS rescore
  19. 2026-09-20 17:47 UTCGHSA enrichment
  20. 2026-09-20 05:07 UTCGHSA enrichment
  21. 2026-09-19 16:27 UTCEG score recompute
  22. 2026-09-19 16:27 UTCGHSA enrichment
  23. 2026-09-19 03:46 UTCEG score recompute
  24. 2026-09-19 03:46 UTCGHSA enrichment
  25. 2026-09-18 19:28 UTCEPSS rescore
Show 52 more
  1. 2026-09-18 15:06 UTCGHSA enrichment
  2. 2026-09-18 02:25 UTCEG score recompute
  3. 2026-09-18 02:25 UTCGHSA enrichment
  4. 2026-09-17 13:45 UTCGHSA enrichment
  5. 2026-09-17 01:05 UTCEG score recompute
  6. 2026-09-17 01:05 UTCGHSA enrichment
  7. 2026-09-16 14:08 UTCEPSS rescore
  8. 2026-09-16 12:25 UTCEG score recompute
  9. 2026-09-16 12:25 UTCGHSA enrichment
  10. 2026-09-16 05:15 UTCEPSS rescore
  11. 2026-09-15 23:44 UTCGHSA enrichment
  12. 2026-09-15 11:04 UTCEG score recompute
  13. 2026-09-15 11:04 UTCGHSA enrichment
  14. 2026-09-15 03:12 UTCEPSS rescore
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-14 22:24 UTCGHSA enrichment
  17. 2026-09-14 09:41 UTCGHSA enrichment
  18. 2026-09-13 21:00 UTCEG score recompute
  19. 2026-09-13 21:00 UTCGHSA enrichment
  20. 2026-09-13 08:19 UTCGHSA enrichment
  21. 2026-09-12 19:40 UTCEG score recompute
  22. 2026-09-12 19:40 UTCGHSA enrichment
  23. 2026-09-12 07:00 UTCGHSA enrichment
  24. 2026-09-11 18:20 UTCEG score recompute
  25. 2026-09-11 18:20 UTCGHSA enrichment
  26. 2026-09-11 14:53 UTCEPSS rescore
  27. 2026-09-11 14:53 UTCEPSS rescore
  28. 2026-09-11 05:39 UTCGHSA enrichment
  29. 2026-09-10 16:57 UTCEG score recompute
  30. 2026-09-10 16:57 UTCGHSA enrichment
  31. 2026-09-10 04:17 UTCGHSA enrichment
  32. 2026-09-09 15:37 UTCGHSA enrichment
  33. 2026-09-09 02:57 UTCEG score recompute
  34. 2026-09-09 02:56 UTCGHSA enrichment
  35. 2026-09-08 22:01 UTCEPSS rescore
  36. 2026-09-08 14:15 UTCGHSA enrichment
  37. 2026-09-08 01:05 UTCEG score recompute
  38. 2026-09-08 01:04 UTCGHSA enrichment
  39. 2026-09-07 12:24 UTCEG score recompute
  40. 2026-09-07 12:24 UTCGHSA enrichment
  41. 2026-09-07 11:28 UTCEG score recompute
  42. 2026-09-07 11:28 UTCGHSA enrichment
  43. 2026-09-07 10:07 UTCGHSA enrichment
  44. 2026-09-06 21:24 UTCEG score recompute
  45. 2026-09-06 21:24 UTCGHSA enrichment
  46. 2026-09-06 13:48 UTCEPSS rescore
  47. 2026-09-06 08:43 UTCGHSA enrichment
  48. 2026-09-05 20:03 UTCEG score recompute
  49. 2026-09-05 20:03 UTCGHSA enrichment
  50. 2026-09-05 07:24 UTCEG score recompute
  51. 2026-09-05 06:49 UTCEG score recompute
  52. 2026-09-05 06:48 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-78438?
CVE-2026-78438 is a high vulnerability published on September 5, 2026. The W3 Total Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Content via LazyLoad Background Mutator in all versions up to, and including, 2.10.5 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to…
When was CVE-2026-78438 disclosed?
CVE-2026-78438 was first published in the National Vulnerability Database on September 5, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78438 actively exploited?
CVE-2026-78438 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 60.0% of all scored CVEs.
What is the CVSS score of CVE-2026-78438?
CVE-2026-78438 has a CVSS v3 base score of 7.2 (NVD).
How do I remediate CVE-2026-78438?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78438, 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-2026-78438

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