CVE-2026-90937 json
froxlor before 2.2.5 nginx/Apache Configuration Injection via subdomain redirect URL
published 4mo ago modified last mo. also EUVD-2026-77455 , GHSA-c3p2-mj7v-5mrc
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository froxlor/froxlor. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 9.9
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 39%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- froxlor froxlor 2.2.5
Is CVE-2026-90937 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- last mo.
Exploit prediction
0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.4 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L |
| CNA | 3.1 | 9.9 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L |
| CNA | 4.0 | 9.4 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- froxlor froxlor
Classification
- Weakness
-
- CWE-93 Improper Neutralization of CRLF Sequences
References
-
github.com
/froxlor/froxlor/security/advisories/GHSA-c3p2-mj7v-5mrc
vendor-advisory, advisory
-
vulncheck.com
/advisories/froxlor-before-2.2.5-nginx-apache-configuration-injection-via-subdomain-redirect-url
third-party-advisory
Sources
- CVE List CVE-2026-90937
- NVD CVE-2026-90937
- Maintainer advisory GHSA-c3p2-mj7v-5mrc
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of froxlor/froxlor published their own advisory on GitHub. Reviewed sources take precedence over it.