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CVE-2024-21641

22
FAUCET Score

CVE-2024-21641 is an open redirect vulnerability affecting Flarum discussion platform software prior to version 1.8.5. It allows an attacker to redirect users from a trusted Flarum domain to any arbitrary link via the /logout route. This vulnerability has a CVSS score of 4.7 (Medium), indicating a low impact on integrity (I:L) and no impact on confidentiality or availability, with a network attack vector (AV:N) and low attack complexity (AC:L). The primary risk is phishing or driving traffic to malicious sites using the trusted domain. There is no evidence of active exploitation, and no Metasploit or ExploitDB modules are available. However, Nuclei templates exist for detection, and despite a high FAUCET Risk Score, there is currently no community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.8.5CPE matchmatch criteria
cpe:2.3:a:flarum:flarum:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.07%
Probability of exploitation in next 30 days
EPSS Percentile
61.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
Nuclei: CVE-2024-21641 · Apr 24, 2025
This CVE's current EPSS score of 0.0107 is in the 74th percentile among its peer group of 26,219 CVEs.

Social Chatter

No social media mentions found for this CVE.

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

composerpatch availablevia ghsa
Product: flarum/coreFixed in: 1.8.5
composerpatch availablevia ghsa
Product: flarum/frameworkFixed in: 1.8.5
github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-733r-8xcp-w9mrmedium

Flarum's logout Route allows open redirects

Jan 5, 2024

References

github.com / flarum/flarum-core/commit/ee8b3b4ad1413a2b0971fdd9e40f812d2a3a9d3a
Patch
github.com / flarum/framework/commit/7d70328471cf3091d92d95c382d277aec7996176
Patch
github.com / flarum/framework/security/advisories/GHSA-733r-8xcp-w9mr
PatchVendor Advisory