CVE-2026-90937

CRITICALPre-NVD 9.99.9—
EchelonGraph scoreHIGH confidence

Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-14. a secondary CVSS source baseline 9.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.9Exploit: None knownExposed: 0

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

froxlor versions before 2.2.5 fail to validate newline characters in subdomain redirect URLs, allowing authenticated customers to inject arbitrary nginx or Apache configuration directives. Attackers can supply URLs containing literal newlines that are written verbatim into vhost config files during cron rebuild, enabling web server configuration corruption, denial of service, or hijacking of HTTP responses across hosted domains.

CVSS v3
9.9
EG Score
9.9(high)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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
Severity99% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
18%
KEV
Not listed

Published

September 14, 2026

Last Modified

September 16, 2026

Advisory Details (2)

Auto-updated Sep 16, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

froxlor before 2.2.5 nginx/Apache Configuration Injection via subdomain redirect URL | Advisories | VulnCheck

https://www.vulncheck.com/advisories/froxlor-before-2.2.5-nginx-apache-configuration-injection-via-subdomain-redirect-url
github Patch Available🟡 PoC Available

Customer-controlled subdomain redirect URL allows nginx/Apache config injection · Advisory · froxlor/froxlor · GitHub

https://github.com/froxlor/froxlor/security/advisories/GHSA-c3p2-mj7v-5mrc

Vendor Advisories for CVE-2026-90937(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 46× in last 7d / 46× 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. 2026-09-19 12:04 UTCGHSA enrichment
  2. 2026-09-19 08:27 UTCGHSA enrichment
  3. 2026-09-19 04:50 UTCGHSA enrichment
  4. 2026-09-19 01:11 UTCGHSA enrichment
  5. 2026-09-18 21:35 UTCEG score recompute
  6. 2026-09-18 21:35 UTCGHSA enrichment
  7. 2026-09-18 19:28 UTCEPSS rescore
  8. 2026-09-18 17:59 UTCGHSA enrichment
  9. 2026-09-18 14:22 UTCGHSA enrichment
  10. 2026-09-18 10:42 UTCGHSA enrichment
  11. 2026-09-18 07:05 UTCGHSA enrichment
  12. 2026-09-18 03:28 UTCGHSA enrichment
  13. 2026-09-17 23:51 UTCGHSA enrichment
  14. 2026-09-17 19:33 UTCEG score recompute
  15. 2026-09-17 19:33 UTCGHSA enrichment
  16. 2026-09-17 19:32 UTCEPSS rescore
  17. 2026-09-17 13:14 UTCGHSA enrichment
  18. 2026-09-17 09:36 UTCGHSA enrichment
  19. 2026-09-17 06:00 UTCGHSA enrichment
  20. 2026-09-17 02:22 UTCGHSA enrichment
  21. 2026-09-16 22:43 UTCGHSA enrichment
  22. 2026-09-16 19:06 UTCGHSA enrichment
  23. 2026-09-16 15:29 UTCEG score recompute
  24. 2026-09-16 15:29 UTCGHSA enrichment
  25. 2026-09-16 15:06 UTCEG score recompute
Show 21 more
  1. 2026-09-16 15:06 UTCGHSA enrichment
  2. 2026-09-16 14:09 UTCEPSS rescore
  3. 2026-09-16 12:29 UTCGHSA enrichment
  4. 2026-09-16 08:52 UTCGHSA enrichment
  5. 2026-09-16 05:15 UTCEG score recompute
  6. 2026-09-16 05:15 UTCGHSA enrichment
  7. 2026-09-16 05:15 UTCEPSS rescore
  8. 2026-09-16 01:39 UTCGHSA enrichment
  9. 2026-09-15 22:02 UTCGHSA enrichment
  10. 2026-09-15 18:25 UTCGHSA enrichment
  11. 2026-09-15 14:48 UTCGHSA enrichment
  12. 2026-09-15 11:11 UTCGHSA enrichment
  13. 2026-09-15 07:34 UTCGHSA enrichment
  14. 2026-09-15 03:57 UTCGHSA enrichment
  15. 2026-09-15 00:19 UTCGHSA enrichment
  16. 2026-09-14 20:42 UTCGHSA enrichment
  17. 2026-09-14 17:05 UTCEG score recompute
  18. 2026-09-14 17:05 UTCGHSA enrichment
  19. 2026-09-14 13:28 UTCEG score recompute
  20. 2026-09-14 13:00 UTCEG score recompute
  21. 2026-09-14 12:59 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-90937?
CVE-2026-90937 is a critical vulnerability published on September 14, 2026. froxlor versions before 2.2.5 fail to validate newline characters in subdomain redirect URLs, allowing authenticated customers to inject arbitrary nginx or Apache configuration directives. Attackers can supply URLs containing literal newlines that are written verbatim into vhost config files during…
When was CVE-2026-90937 disclosed?
CVE-2026-90937 was first published in the National Vulnerability Database on September 14, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-90937 actively exploited?
CVE-2026-90937 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 82.0% of all scored CVEs.
What is the CVSS score of CVE-2026-90937?
CVE-2026-90937 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-90937?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-90937, 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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