CVE-2026-73259 Details
Description
Mongoose is an embedded web server and network library. Prior to 7.22, a remote attacker can send a crafted percent-encoded request path to a deployment using MG_ENABLE_DIRLIST and persuade a user to visit it. The mg_http_serve_dir() and listdir() path in src/http.c places the decoded request URI into the title and h1 elements without HTML entity encoding. The resulting reflected cross-site scripting executes in the Mongoose origin and can expose session data or perform actions as the victim. This issue is fixed in version 7.22.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Aug 20, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/cesanta/mongoose/security/advisories/GHSA-9cwm-487w-h25w | CISA-ADP | ExploitVendor Advisory |
| https://github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c16869e71 | [email protected] | Patch |
| https://github.com/cesanta/mongoose/pull/3611 | [email protected] | Issue TrackingPatch |
| https://github.com/cesanta/mongoose/releases/tag/7.22 | [email protected] | Release Notes |
| https://github.com/cesanta/mongoose/security/advisories/GHSA-9cwm-487w-h25w | [email protected] | ExploitVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| cesanta mongoose | < 7.22 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 18, 2026 | CVE Translated | [email protected] |
| Sep 29, 2026 | Initial Analysis | [email protected] |
| Aug 20, 2026 | CVE Modified | CISA-ADP |
| Aug 20, 2026 | New CVE Received | [email protected] |