CVE-2026-55677
Echo: Encoded slash (%2F) bypasses route-level protection and exposes static files
Description
Echo is a Go web framework. Prior to 4.15.3 and 5.2.0, Echo's router and static file handler disagree on URL path decoding. The router matches routes using the raw encoded path (preserving %2F as-is), while StaticDirectoryHandler unescapes %2F to / before resolving filesystem paths. This allows an attacker to bypass route-level access controls and read static files without authorization. This vulnerability is fixed in 4.15.3 and 5.2.0.
INFO
Published Date :
June 26, 2026, 4:15 p.m.
Last Modified :
June 26, 2026, 4:15 p.m.
Remotely Exploit :
Yes !
Source :
GitHub_M
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update Echo framework to version 4.15.3 or later.
- Update Echo framework to version 5.2.0 or later.
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