GHSA-98j2-3j3p-fw2v
CRITICALSession Middleware Token Injection Vulnerability
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Blast Radius
github.com/gofiber/fiber🐹github.com/gofiber/fiber/v2🐹github.com/gofiber/fiber/v2/middleware/sessionReal-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
A security vulnerability has been identified in the Fiber session middleware where a user can supply their own session_id value, leading to the creation of a session with that key.
Impact
The identified vulnerability is a session middleware issue in GoFiber versions 2 and above. This vulnerability allows users to supply their own session_id value, resulting in the creation of a session with that key. If a website relies on the mere presence of a session for security purposes, this can lead to significant security risks, including unauthorized access and session fixation attacks. All users utilizing GoFiber's session middleware in the affected versions are impacted.
Patches
The issue has been addressed in the latest patch. Users are strongly encouraged to upgrade to version 2.52.5 or higher to mitigate this vulnerability.
Workarounds
Users who are unable to upgrade immediately can apply the following workarounds to reduce the risk:
- Validate Session IDs: Implement additional validation to ensure session IDs are not supplied by the user and are securely generated by the server.
- Session Management: Regularly rotate session IDs and enforce strict session expiration policies.
References
For more information on session best practices:
Users are encouraged to review these references and take immediate action to secure their applications.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/gofiber/fiber | all versions | 2.52.5 |
| 🐹Go | github.com/gofiber/fiber/v2 | all versions | 2.52.5 |
| 🐹Go | github.com/gofiber/fiber/v2/middleware/session | all versions | 2.52.5 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/gofiber/fiber. 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/gofiber/fiber to 2.52.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-98j2-3j3p-fw2v 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-98j2-3j3p-fw2v 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-98j2-3j3p-fw2v. 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-98j2-3j3p-fw2v in your dependencies?
O3 detects GHSA-98j2-3j3p-fw2v across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.