Vulnerability · Published Sep 28, 2026 · Assigned by VulnCheck
CVE-2026-102333httpdbg before 2.2.1 Stored Cross-Site Scripting via javascript URL
Medium 6.1
In plain English
A medium-severity cross-site scripting in httpdbg from cle-b. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities).
Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.3%top 82.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
httpdbg before 2.2.1 fails to validate URL schemes in recorded HTTP request URLs rendered as clickable links in the web interface. Attackers controlling traffic recorded by httpdbg can supply javascript: scheme URLs that execute malicious scripts in the application origin when clicked, allowing access to captured request and response data including headers and tokens.
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
References
- https://github.com/cle-b/httpdbg/issues/220 issue-tracking
- https://github.com/cle-b/httpdbg/pull/222 patch, issue-tracking
- https://github.com/cle-b/httpdbg/commit/121845b41c19ddaf30b51be0797bc2ff4847d8b3 patch
- httpdbg v2.2.1 Release Notes release-notes
- https://github.com/cle-b/httpdbg/blob/v2.2.0/httpdbg/webapp/static/index.htm#L302 technical-description
- https://github.com/cle-b/httpdbg/blob/v2.2.0/httpdbg/hooks/recordhttp2.py#L88-L97 technical-description
- https://github.com/cle-b/httpdbg product
- VulnCheck Advisory: httpdbg before 2.2.1 Stored Cross-Site Scripting via javascript URL third-party-advisory