CVE-2021-21338: Open Redirection in Login Handling
Vulnerability summary
CVE-2021-21338 is a medium (CVSS 6.1) URL Redirection to Untrusted Site vulnerability in typo3. EPSS estimates a 1.10% chance of exploitation in the next 30 days, higher than 65.7% of scored vulnerabilities.
Not severe (CVSS 4.7, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Timeline
- 23-03-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 6.2.57, 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1 it has been discovered that Login Handling is susceptible to open redirection which allows attackers redirecting to arbitrary content, and conducting phishing attacks. No authentication is required in order to exploit this vulnerability. This is fixed in versions 6.2.57, 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1.
CVSS metrics
3 scores · 2 sources · 2 versions- CVE.orgCNA4.7MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:NDiffers
EPSS trend
Probability
1.10%
Chance of exploitation in the next 30 days
Percentile
66%
Versus all other CVEs
30-day change
No change 0.00 pp
From 1.10% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.
1 vendor · 2 products
References
3 links- github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-4jhw-2p6j-5wmpX Refsource CONFIRMThird Party Advisory