CVE-2026-73254Mongoose: Stored XSS via unescaped filenames in directory listing
Updated under an hour ago ()
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It affects cesanta mongoose. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Mongoose is an embedded web server and network library. Prior to 7.22, an attacker who can create a file with an HTML payload in its name can trigger stored cross-site scripting when a user browses a directory served with MG_ENABLE_DIRLIST. The printdirentry() path called by listdir() in src/http.c URL-encodes the href but inserts the raw filesystem filename into the HTML link text. The browser executes the injected markup in the Mongoose origin, which can expose session data or permit actions as the victim. This issue is fixed in version 7.22.
- CVSS
- 5.4 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
- Weakness (CWE)
- CWE-79
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Aug 21, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
cesanta mongoose cesanta:mongoose (from the name) | before 7.22 | CNA record |
cesanta mongoose cesanta:mongoose | before 7.22 | NVD |
References
- https://github.com/cesanta/mongoose/security/advisories/GHSA-5g6j-m3pv-4f7gx-refsource-confirm, exploit, vendor-advisory
- https://github.com/cesanta/mongoose/pull/3611x-refsource-misc, issue-tracking, patch
- https://github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c16869e71x-refsource-misc, patch
- https://github.com/cesanta/mongoose/releases/tag/7.22x-refsource-misc, release-notes
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.