CVE-2026-78834

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-08. 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.

A code execution vulnerability exists in CMSimple 5.22 in the CoAuthors plugin. An authenticated low-privileged user who can modify page content and provide controlled imported content can trigger server-side execution by referencing crafted external or uploaded text content through the affected content import feature.

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
50%
KEV
Not listed

Published

September 8, 2026

Last Modified

September 9, 2026

Advisory Details (2)

Auto-updated Sep 9, 2026
No patch confirmed yet.
generic

CVE-2026-78834 · GitHub

https://gist.github.com/AEQ3/574cb644306776a9ff1a0de30b085e62
generic

CMSimple 5.22 Code execution vulnerability · Issue #1 · AEQ3/CVE · GitHub

https://github.com/AEQ3/CVE/issues/1

Vendor Advisories for CVE-2026-78834(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 / 66× 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 01:37 UTCEG score recompute
  2. 2026-09-25 01:37 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-24 13:21 UTCGHSA enrichment
  5. 2026-09-24 01:05 UTCEG score recompute
  6. 2026-09-24 01:05 UTCGHSA enrichment
  7. 2026-09-23 17:54 UTCEPSS rescore
  8. 2026-09-23 12:50 UTCGHSA enrichment
  9. 2026-09-23 00:34 UTCEG score recompute
  10. 2026-09-23 00:34 UTCGHSA enrichment
  11. 2026-09-22 16:01 UTCEPSS rescore
  12. 2026-09-22 12:18 UTCGHSA enrichment
  13. 2026-09-22 00:02 UTCEG score recompute
  14. 2026-09-22 00:02 UTCGHSA enrichment
  15. 2026-09-21 21:09 UTCEPSS rescore
  16. 2026-09-21 11:47 UTCGHSA enrichment
  17. 2026-09-20 23:32 UTCEG score recompute
  18. 2026-09-20 23:32 UTCGHSA enrichment
  19. 2026-09-20 20:16 UTCEPSS rescore
  20. 2026-09-20 11:16 UTCGHSA enrichment
  21. 2026-09-19 23:00 UTCEG score recompute
  22. 2026-09-19 23:00 UTCGHSA enrichment
  23. 2026-09-19 10:44 UTCGHSA enrichment
  24. 2026-09-18 22:21 UTCEG score recompute
  25. 2026-09-18 22:21 UTCGHSA enrichment
Show 41 more
  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 10:06 UTCGHSA enrichment
  3. 2026-09-17 21:50 UTCEG score recompute
  4. 2026-09-17 21:50 UTCGHSA enrichment
  5. 2026-09-17 09:34 UTCGHSA enrichment
  6. 2026-09-16 21:18 UTCEG score recompute
  7. 2026-09-16 21:18 UTCGHSA enrichment
  8. 2026-09-16 14:08 UTCEPSS rescore
  9. 2026-09-16 08:58 UTCEG score recompute
  10. 2026-09-16 08:58 UTCGHSA enrichment
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-15 19:42 UTCGHSA enrichment
  13. 2026-09-15 07:17 UTCEG score recompute
  14. 2026-09-15 07:17 UTCGHSA enrichment
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-15 03:12 UTCEPSS rescore
  17. 2026-09-14 19:01 UTCGHSA enrichment
  18. 2026-09-14 06:45 UTCGHSA enrichment
  19. 2026-09-13 18:29 UTCEG score recompute
  20. 2026-09-13 18:29 UTCGHSA enrichment
  21. 2026-09-13 06:13 UTCGHSA enrichment
  22. 2026-09-12 17:57 UTCEG score recompute
  23. 2026-09-12 17:57 UTCGHSA enrichment
  24. 2026-09-12 05:41 UTCGHSA enrichment
  25. 2026-09-11 17:25 UTCEG score recompute
  26. 2026-09-11 17:25 UTCGHSA enrichment
  27. 2026-09-11 14:53 UTCEPSS rescore
  28. 2026-09-11 14:53 UTCEPSS rescore
  29. 2026-09-11 04:56 UTCGHSA enrichment
  30. 2026-09-10 16:40 UTCEG score recompute
  31. 2026-09-10 16:40 UTCGHSA enrichment
  32. 2026-09-10 04:24 UTCGHSA enrichment
  33. 2026-09-09 16:08 UTCEG score recompute
  34. 2026-09-09 16:08 UTCGHSA enrichment
  35. 2026-09-09 14:30 UTCGHSA enrichment
  36. 2026-09-09 13:27 UTCEG score recompute▲ 8.80
  37. 2026-09-09 13:27 UTCGHSA enrichment
  38. 2026-09-09 13:25 UTCMITRE cvelistV5CVSS v3 → 8.8 · severity → HIGH
  39. 2026-09-08 20:31 UTCNVD update
  40. 2026-09-08 20:15 UTCEG score recompute
  41. 2026-09-08 20:14 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-78834?
CVE-2026-78834 is a high vulnerability published on September 8, 2026. A code execution vulnerability exists in CMSimple 5.22 in the CoAuthors plugin. An authenticated low-privileged user who can modify page content and provide controlled imported content can trigger server-side execution by referencing crafted external or uploaded text content through the affected…
When was CVE-2026-78834 disclosed?
CVE-2026-78834 was first published in the National Vulnerability Database on September 8, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78834 actively exploited?
CVE-2026-78834 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 50.4% of all scored CVEs.
What is the CVSS score of CVE-2026-78834?
CVE-2026-78834 has a CVSS v3.1 base score of 8.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-78834?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78834, 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-2026-78834

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