GHSA-5mmw-p5qv-w3x5
MEDIUMGHSA-5mmw-p5qv-w3x5 is a medium-severity (CVSS 5.3) CWE-345 vulnerability in github.com/mojocn/base64Captcha. 1 public exploit reference exists, so weaponization risk is real. O3 Security confirms whether GHSA-5mmw-p5qv-w3x5 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Always incorrect control flow in github.com/mojocn/base64Captcha
Blast Radius
github.com/mojocn/base64CaptchaReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
When using the default implementation of Verify to check a Captcha, verification can be bypassed. For example, if the first parameter is a non-existent id, the second parameter is an empty string, and the third parameter is true, the function will always consider the Captcha to be correct.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/mojocn/base64Captcha | all versions | 1.3.6 |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/mojocn/base64Captcha. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update github.com/mojocn/base64Captcha to 1.3.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-5mmw-p5qv-w3x5 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-5mmw-p5qv-w3x5 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-5mmw-p5qv-w3x5. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-5mmw-p5qv-w3x5 in your dependencies?
O3 detects GHSA-5mmw-p5qv-w3x5 across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.