Vulnerability Details CVE-2026-73254
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 24.7%
CVSS Severity
CVSS v3 Score 5.4
References
- https://github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c16869e71
- https://github.com/cesanta/mongoose/pull/3611
- https://github.com/cesanta/mongoose/releases/tag/7.22
- https://github.com/cesanta/mongoose/security/advisories/GHSA-5g6j-m3pv-4f7g
- https://github.com/cesanta/mongoose/security/advisories/GHSA-5g6j-m3pv-4f7g
Products affected by CVE-2026-73254
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cpe:2.3:a:cesanta:mongoose:-
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cpe:2.3:a:cesanta:mongoose:3.2
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cpe:2.3:a:cesanta:mongoose:3.3
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cpe:2.3:a:cesanta:mongoose:3.4
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cpe:2.3:a:cesanta:mongoose:3.5
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cpe:2.3:a:cesanta:mongoose:3.6
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cpe:2.3:a:cesanta:mongoose:3.7
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cpe:2.3:a:cesanta:mongoose:3.8
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cpe:2.3:a:cesanta:mongoose:4.0
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cpe:2.3:a:cesanta:mongoose:4.1
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cpe:2.3:a:cesanta:mongoose:5.0
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cpe:2.3:a:cesanta:mongoose:5.1
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cpe:2.3:a:cesanta:mongoose:5.2
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cpe:2.3:a:cesanta:mongoose:5.3
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cpe:2.3:a:cesanta:mongoose:5.4
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cpe:2.3:a:cesanta:mongoose:5.5
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cpe:2.3:a:cesanta:mongoose:5.6
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cpe:2.3:a:cesanta:mongoose:6.0
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cpe:2.3:a:cesanta:mongoose:6.1
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cpe:2.3:a:cesanta:mongoose:6.10
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cpe:2.3:a:cesanta:mongoose:6.11
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cpe:2.3:a:cesanta:mongoose:6.12
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cpe:2.3:a:cesanta:mongoose:6.13
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cpe:2.3:a:cesanta:mongoose:6.14
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cpe:2.3:a:cesanta:mongoose:6.15
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cpe:2.3:a:cesanta:mongoose:6.16
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cpe:2.3:a:cesanta:mongoose:6.17
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cpe:2.3:a:cesanta:mongoose:6.18
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cpe:2.3:a:cesanta:mongoose:6.2
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cpe:2.3:a:cesanta:mongoose:6.3
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cpe:2.3:a:cesanta:mongoose:6.4
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cpe:2.3:a:cesanta:mongoose:6.5
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cpe:2.3:a:cesanta:mongoose:6.6
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cpe:2.3:a:cesanta:mongoose:6.7
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cpe:2.3:a:cesanta:mongoose:6.8
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cpe:2.3:a:cesanta:mongoose:6.9
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cpe:2.3:a:cesanta:mongoose:7.0
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cpe:2.3:a:cesanta:mongoose:7.1
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cpe:2.3:a:cesanta:mongoose:7.10
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cpe:2.3:a:cesanta:mongoose:7.11
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cpe:2.3:a:cesanta:mongoose:7.12
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cpe:2.3:a:cesanta:mongoose:7.13
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cpe:2.3:a:cesanta:mongoose:7.14
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cpe:2.3:a:cesanta:mongoose:7.15
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cpe:2.3:a:cesanta:mongoose:7.16
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cpe:2.3:a:cesanta:mongoose:7.17
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cpe:2.3:a:cesanta:mongoose:7.18
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cpe:2.3:a:cesanta:mongoose:7.19
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cpe:2.3:a:cesanta:mongoose:7.2
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cpe:2.3:a:cesanta:mongoose:7.20
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cpe:2.3:a:cesanta:mongoose:7.21
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cpe:2.3:a:cesanta:mongoose:7.3
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cpe:2.3:a:cesanta:mongoose:7.4
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cpe:2.3:a:cesanta:mongoose:7.5
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cpe:2.3:a:cesanta:mongoose:7.6
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cpe:2.3:a:cesanta:mongoose:7.7
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cpe:2.3:a:cesanta:mongoose:7.8
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cpe:2.3:a:cesanta:mongoose:7.9