CVE-2026-73679

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 — 4 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: 1%CVSS: 7.2Exploit: None knownExposed: 0

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

ImpressCMS contains an authenticated remote code execution vulnerability in the custom tag module that allows authenticated administrators to execute arbitrary PHP code by storing a malicious payload in a custom tag with PHP type enabled. The application decodes HTML-encoded content via undoHtmlSpecialChars() before passing it to eval() in the renderWithPhp() method, bypassing HTML Purifier sanitization, and the payload is triggered on every frontend page load through the preload event system.

CVSS v3
7.2
EG Score
7.2(high)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
47%
KEV
Not listed

Published

August 14, 2026

Last Modified

August 17, 2026

Advisory Details (3)

Auto-updated Aug 14, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

ImpressCMS Authenticated RCE via PHP Custom Tag eval() | Advisories | VulnCheck

https://www.vulncheck.com/advisories/impresscms-authenticated-rce-via-php-custom-tag-eval
generic🟡 PoC Available

VULN-POC/ImpressCMSRCCE.md at main · DevVaibhav07/VULN-POC · GitHub

https://github.com/DevVaibhav07/VULN-POC/blob/main/ImpressCMSRCCE.md
generic

GitHub - ImpressCMS/impresscms: A multilingual, extensible, community oriented CMS developed in PHP · GitHub

https://github.com/ImpressCMS/impresscms

Vendor Advisories for CVE-2026-73679(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 30× in last 7d / 30× 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 21:30 UTCGHSA enrichment
  2. 2026-08-20 10:36 UTCGHSA enrichment
  3. 2026-08-19 23:42 UTCEG score recompute
  4. 2026-08-19 23:42 UTCGHSA enrichment
  5. 2026-08-19 17:04 UTCEPSS rescore
  6. 2026-08-19 12:47 UTCGHSA enrichment
  7. 2026-08-19 01:52 UTCGHSA enrichment
  8. 2026-08-18 14:58 UTCEG score recompute
  9. 2026-08-18 14:58 UTCGHSA enrichment
  10. 2026-08-18 13:49 UTCEPSS rescore
  11. 2026-08-18 13:49 UTCEPSS rescore
  12. 2026-08-18 03:26 UTCGHSA enrichment
  13. 2026-08-17 16:25 UTCEG score recompute
  14. 2026-08-17 16:25 UTCGHSA enrichment
  15. 2026-08-17 13:47 UTCEPSS rescore
  16. 2026-08-17 13:18 UTCGHSA enrichment
  17. 2026-08-17 02:24 UTCGHSA enrichment
  18. 2026-08-16 15:29 UTCEG score recompute
  19. 2026-08-16 15:29 UTCGHSA enrichment
  20. 2026-08-16 14:56 UTCEPSS rescore
  21. 2026-08-16 14:56 UTCEPSS rescore
  22. 2026-08-16 04:35 UTCEG score recompute
  23. 2026-08-16 04:35 UTCGHSA enrichment
  24. 2026-08-16 02:15 UTCEPSS rescore
  25. 2026-08-15 17:41 UTCGHSA enrichment
Show 5 more
  1. 2026-08-15 06:47 UTCEG score recompute
  2. 2026-08-15 06:47 UTCGHSA enrichment
  3. 2026-08-14 19:36 UTCEG score recompute
  4. 2026-08-14 19:14 UTCEG score recompute
  5. 2026-08-14 19:13 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-73679?
CVE-2026-73679 is a high vulnerability published on August 14, 2026. ImpressCMS contains an authenticated remote code execution vulnerability in the custom tag module that allows authenticated administrators to execute arbitrary PHP code by storing a malicious payload in a custom tag with PHP type enabled. The application decodes HTML-encoded content via…
When was CVE-2026-73679 disclosed?
CVE-2026-73679 was first published in the National Vulnerability Database on August 14, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73679 actively exploited?
CVE-2026-73679 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 53.5% of all scored CVEs.
What is the CVSS score of CVE-2026-73679?
CVE-2026-73679 has a CVSS v3 base score of 7.2 (NVD).
How do I remediate CVE-2026-73679?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-73679, 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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