CVE-2021-22256Public exploitNetwork attack vector

Guest issue creation via unchecked Sentry linkage

Published Aug 25, 2021 · Updated Aug 3, 2024

Improper authorization in affected GitLab CE/EE releases allows remote authenticated users to create issues linked to Sentry errors. The issue creation path accepts sentry_issue_attributes with an attacker-chosen Sentry error identifier from Guest users, although Error Tracking requires Reporter access. A private project, Guest membership, configured Sentry integration, and an existing Sentry error are required; the forged link exposes status changes made by maintainers.

CVSS severity5.4
Medium
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in affected GitLab CE/EE releases allows remote authenticated users to create issues linked to Sentry errors. The issue creation path accepts sentry_issue_attributes with an attacker-chosen Sentry error identifier from Guest users, although Error Tracking requires Reporter access. A private project, Guest membership, configured Sentry integration, and an existing Sentry error are required; the forged link exposes status changes made by maintainers.

The record

CVE
CVE-2021-22256
Published
Aug 25, 2021
Updated
Aug 3, 2024
Vendor
GitLab
Product
GitLab
Classifications
CWE-863, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 25, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=>=12.6, <13.12.9
  2. Affected versionversion=>=14.0, <14.0.7
  3. Affected versionversion=>=14.1, <14.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=>=12.6, <13.12.9; version=>=14.0, <14.0.7; version=>=14.1, <14.1.2

Published CVSS scores

5.4GitLab Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
4.3GitLabCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
5.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1190Exploit Public-Facing Application

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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