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CVE-2023-41338

17
FAUCET Score

CVE-2023-41338 is a medium-severity vulnerability affecting GoFiber versions prior to 2.49.2, where the ctx.IsFromLocal method incorrectly identifies requests as originating from localhost. An attacker can bypass access restrictions by setting the X-Forwarded-For header to 127.0.0.1, potentially gaining unauthorized access to resources intended only for local processes. The CVSS score is 5.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N), indicating a network-based attack with low complexity and a potential for limited confidentiality impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.49.2CPE matchmatch criteria
cpe:2.3:a:gofiber:fiber:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.53%
Probability of exploitation in next 30 days
EPSS Percentile
41.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0053 is in the 27th percentile among its peer group of 23,723 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
gopatch availablevia ghsa
Product: github.com/gofiber/fiber/v2Fixed in: 2.49.2

Vendor Advisories (1)

goGHSA-3q5p-3558-364fmedium

Fiber unauthorized access vulnerability in `ctx.IsFromLocal()`

Sep 8, 2023

References

developer.mozilla.org / en-US/docs/Web/HTTP/Headers/X-Forwarded-For
Technical Description
docs.gofiber.io / api/ctx
Product
github.com / gofiber/fiber/commit/b8c9ede6efa231116c4bd8bb9d5e03eac1cb76dc
Patch
github.com / gofiber/fiber/security/advisories/GHSA-3q5p-3558-364f
Vendor Advisory