CVE-2021-22213Public exploitNetwork attack vector

OAuth token theft via cross-origin redirect leak

Published Jun 8, 2021 · Updated Aug 3, 2024

Cross-site leak in GitLab CE/EE allows remote attackers to steal OAuth access tokens by luring Safari users to a malicious page. The OAuth authorization endpoint sends a cross-origin 302 containing the authorization code, and Safari exposes that redirect URL to a malicious page through SecurityPolicyViolationEvent.documentURI. The victim must use a susceptible Safari configuration and have previously authorized the targeted OAuth application; the exposed code enables access under that grant.

CVSS severity8.8
High
EPSS probability1.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site leak in GitLab CE/EE allows remote attackers to steal OAuth access tokens by luring Safari users to a malicious page. The OAuth authorization endpoint sends a cross-origin 302 containing the authorization code, and Safari exposes that redirect URL to a malicious page through SecurityPolicyViolationEvent.documentURI. The victim must use a susceptible Safari configuration and have previously authorized the targeted OAuth application; the exposed code enables access under that grant.

The record

CVE
CVE-2021-22213
Published
Jun 8, 2021
Updated
Aug 3, 2024
Vendor
GitLab
Product
GitLab
Classifications
T1528
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>=13.11, <13.11.5
  2. Affected versionversion=>=13.12, <13.12.2
  3. Affected versionversion=>=7.10, <13.10.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GitLab · GitLabversion=>=13.11, <13.11.5; version=>=13.12, <13.12.2; version=>=7.10, <13.10.5

Published CVSS scores

8.8GitLab Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1528Steal Application Access Token

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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