Vulnerability · Published Oct 4, 2021 · Assigned by GitLab

CVE-2021-39873

Medium 4.3

In plain English

A medium-severity security flaw in GitLab from GitLab. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 64% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)1.0%top 35.7% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

In all versions of GitLab CE/EE, there exists a content spoofing vulnerability which may be leveraged by attackers to trick users into visiting a malicious website by spoofing the content in an error response.

Affected products (as reported)

Vendor	Product	Versions
GitLab	GitLab	>=1.0, <14.1.7>=14.2, <14.2.5>=14.3, <14.3.1

References

https://gitlab.com/gitlab-org/gitlab/-/issues/27241 x_refsource_MISC
https://hackerone.com/reports/504961 x_refsource_MISC
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39873.json x_refsource_CONFIRM