CVE-2026-89145

MEDIUMPre-NVD 4.24.2—
EchelonGraph scoreHIGH confidence

Score 4.2 from GitHub Security Advisory (severity: LOW) published 2026-09-11. a secondary CVSS source baseline 4.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
4.2EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.2Exploit: None knownExposed: 0

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

Flextype CMS versions 0.9.9 through 1.0.0-alpha.3 fail to HTML-escape plugin directory names in the dependency error page rendered by getValidPluginsDependencies(). Attackers with write access to the plugins directory can create a plugin with HTML characters in its name to execute arbitrary scripts in users' browsers when dependency validation fails.

CVSS v3
4.2
EG Score
4.2(high)
EG Risk
19(Track)
EG Risk 19/100SSVC: 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
Severity42% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

September 11, 2026

Last Modified

September 24, 2026

Advisory Details (4)

Auto-updated Sep 11, 2026
No patch confirmed yet.
generic

Flextype CMS 0.9.9 through 1.0.0-alpha.3 Stored XSS via Plugin Directory | Advisories | VulnCheck

https://www.vulncheck.com/advisories/flextype-cms-0.9.9-through-1.0.0-alpha.3-stored-xss-via-plugin-directory
generic

flextype/src/flextype/core/Plugins.php at aea4ead8c449ea5517ed53b6dcbd28b0a528ad9d · flextype/flextype · GitHub

https://github.com/flextype/flextype/blob/aea4ead8c449ea5517ed53b6dcbd28b0a528ad9d/src/flextype/core/Plugins.php#L345
generic

GitHub - flextype/flextype: Modern Open Source Flat Files Content Management System. · GitHub

https://github.com/flextype/flextype
generic

Stored XSS via unescaped plugin directory name · Issue #597 · flextype/flextype · GitHub

https://github.com/flextype/flextype/issues/597

Vendor Advisories for CVE-2026-89145(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 19× in last 7d / 45× 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 20:56 UTCEG score recompute
  2. 2026-09-24 20:56 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-23 21:31 UTCEG score recompute
  5. 2026-09-23 21:31 UTCGHSA enrichment
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-22 21:14 UTCEG score recompute
  8. 2026-09-22 21:14 UTCGHSA enrichment
  9. 2026-09-22 16:01 UTCEPSS rescore
  10. 2026-09-21 21:09 UTCEPSS rescore
  11. 2026-09-21 20:56 UTCGHSA enrichment
  12. 2026-09-20 20:39 UTCEG score recompute
  13. 2026-09-20 20:39 UTCGHSA enrichment
  14. 2026-09-20 20:16 UTCEPSS rescore
  15. 2026-09-19 20:21 UTCEG score recompute
  16. 2026-09-19 20:21 UTCGHSA enrichment
  17. 2026-09-18 20:03 UTCEG score recompute
  18. 2026-09-18 20:03 UTCGHSA enrichment
  19. 2026-09-18 19:28 UTCEPSS rescore
  20. 2026-09-17 19:45 UTCEG score recompute
  21. 2026-09-17 19:45 UTCGHSA enrichment
  22. 2026-09-17 19:32 UTCEPSS rescore
  23. 2026-09-16 18:08 UTCEG score recompute
  24. 2026-09-16 18:07 UTCGHSA enrichment
  25. 2026-09-16 14:09 UTCEPSS rescore
Show 20 more
  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-15 16:41 UTCEG score recompute
  3. 2026-09-15 16:41 UTCGHSA enrichment
  4. 2026-09-15 03:12 UTCEPSS rescore
  5. 2026-09-14 16:23 UTCEG score recompute
  6. 2026-09-14 16:23 UTCGHSA enrichment
  7. 2026-09-13 16:48 UTCEPSS rescore
  8. 2026-09-13 16:05 UTCGHSA enrichment
  9. 2026-09-12 15:47 UTCEG score recompute
  10. 2026-09-12 15:47 UTCGHSA enrichment
  11. 2026-09-12 15:02 UTCEPSS rescore
  12. 2026-09-11 15:29 UTCEG score recompute
  13. 2026-09-11 15:29 UTCGHSA enrichment
  14. 2026-09-11 14:53 UTCEPSS rescore
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-11 14:35 UTCEG score recompute
  17. 2026-09-11 14:35 UTCGHSA enrichment
  18. 2026-09-11 02:20 UTCEG score recompute
  19. 2026-09-11 01:30 UTCEG score recompute
  20. 2026-09-11 01:29 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-89145?
CVE-2026-89145 is a medium vulnerability published on September 11, 2026. Flextype CMS versions 0.9.9 through 1.0.0-alpha.3 fail to HTML-escape plugin directory names in the dependency error page rendered by getValidPluginsDependencies(). Attackers with write access to the plugins directory can create a plugin with HTML characters in its name to execute arbitrary scripts…
When was CVE-2026-89145 disclosed?
CVE-2026-89145 was first published in the National Vulnerability Database on September 11, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-89145 actively exploited?
CVE-2026-89145 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 93.4% of all scored CVEs.
What is the CVSS score of CVE-2026-89145?
CVE-2026-89145 has a CVSS v3 base score of 4.2 (NVD).
How do I remediate CVE-2026-89145?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-89145, 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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