What’s Vulnerable › Vulnerabilities

CVE-2026-102333: httpdbg before 2.2.1 Stored Cross-Site Scripting via javascript URL

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-28 · updated 2026-09-30
• Weakness: CWE-79

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

• cle-b httpdbg: before 2.2.1 — fixed in 2.2.1

How to fix

Upgrade to a fixed version: cle-b httpdbg 2.2.1. Check the vendor advisory for mitigations.

References

• https://github.com/cle-b/httpdbg
• https://github.com/cle-b/httpdbg/blob/v2.2.0/httpdbg/hooks/recordhttp2.py#L88-L97
• https://github.com/cle-b/httpdbg/blob/v2.2.0/httpdbg/webapp/static/index.htm#L302
• https://github.com/cle-b/httpdbg/commit/121845b41c19ddaf30b51be0797bc2ff4847d8b3
• https://github.com/cle-b/httpdbg/issues/220
• https://github.com/cle-b/httpdbg/pull/222
• https://github.com/cle-b/httpdbg/releases/tag/v2.2.1
• https://www.vulncheck.com/advisories/httpdbg-before-2.2.1-stored-cross-site-scripting-via-javascript-url
• https://github.com/cle-b/httpdbg/issues/220

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