How severe is CVE-2024-38513?

CVE-2024-38513 has a CVSS score of 10/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2024-38513?

CVE-2024-38513 affects the following packages: github.com/gofiber/fiber (Go), github.com/gofiber/fiber/v2 (Go), github.com/gofiber/fiber/v2/middleware/session (Go). Ecosystems affected: Go.

How do I fix CVE-2024-38513?

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 CVE-2024-38513 is resolved across your whole dependency graph.

How do I detect CVE-2024-38513 in my Go dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/gofiber/fiber, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2024-38513 if there is no patch (or I can't update yet)?

Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Is CVE-2024-38513 actively exploited in the wild?

No public exploit code has been indexed for CVE-2024-38513 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2024-38513?

CVE-2024-38513 has an EPSS (Exploit Prediction Scoring System) score of 0.7%, placing it in the 53th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2024-38513?

CVE-2024-38513 is classified as CWE-384 (CWE-384). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2024-38513 published, and has it been updated?

CVE-2024-38513 was published on July 1, 2024 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐹

🐹 Go

Not in CISA KEV

CRITICAL severity

CVE-2024-38513 — fiber

CRITICALFix: gofiber/fiber@66a8814

CVE-2024-38513 is a critical-severity (CVSS 10) CWE-384 vulnerability in github.com/gofiber/fiber. A fix is available for github.com/gofiber/fiber — see the affected versions and patch details below.

Fiber Session Middleware Token Injection Vulnerability

Also known asGHSA-98j2-3j3p-fw2vGO-2024-2959

Published

Jul 1, 2024

Updated

Oct 28, 2026

Affected

3 pkgs

Patched

3 / 3

Exploits

None indexed

Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
A successful exploit gives an attacker total control of the affected component, not partial access.
CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2024-38513.

EPSS Exploitation Probability

via FIRST.org ↗

0.7%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs53th percentile — riskier than 53% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

3 pkgs affected

🐹github.com/gofiber/fiber🐹github.com/gofiber/fiber/v2🐹github.com/gofiber/fiber/v2/middleware/session

Real-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:

OWASP Session Management Cheat Sheet

Users are encouraged to review these references and take immediate action to secure their applications.

Affected Packages

3 total 3 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/gofiber/fiber`	all versions	2.52.5`go get github.com/gofiber/fiber@v2.52.5`
🐹Go	`github.com/gofiber/fiber/v2`	all versions	2.52.5`go get github.com/gofiber/fiber/v2@v2.52.5`
🐹Go	`github.com/gofiber/fiber/v2/middleware/session`	all versions	2.52.5`go get github.com/gofiber/fiber/v2/middleware/session@v2.52.5`

Affected Products

1 product · 1 configurations

Application

fibergofiber

< 2.52.5

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/gofiber/fiber, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
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 CVE-2024-38513 is resolved across your whole dependency graph.
Workarounds
Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

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