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TI-2026-40326 Aliases CVE-2026-55867GHSA-j769-9gv9-65gr

Graylog token revocation endpoint allows authenticated users to delete other users’ access tokens

Priority LOW 25CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-639.

Summary

Graylog is a free and open log management platform. From 6.2.0 until 6.3.12, 7.0.7, and 7.1.2, the DELETE /users/{userId}/tokens/{idOrToken} endpoint implemented by UsersResource.revokeToken() in graylog2-server/src/main/java/org/graylog2/rest/resources/users/UsersResource.java checks USERS_TOKENREMOVE permission against the attacker-controlled userId path parameter before resolving the token selected by idOrToken. An authenticated user can provide an authorized userId while accessTokenService.loadById() or accessTokenService.load() resolves a token belonging to another user, including a service account or administrator, after which accessTokenService.destroy() deletes that token without checking AccessToken.getUserName(). The issue does not expose token contents, but unauthorized deletion causes integrity impact and can disrupt access-token-based integrations. This issue is fixed in versions 6.3.12, 7.0.7, and 7.1.2.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00565 47th percentileScored 2026-11-07
Fix Fixed graylog2-server (Graylog2): 6.3.12, 7.0.7, 7.1.2org.graylog2:graylog2-server (Maven): 6.3.12, 7.0.7, 7.1.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Graylog2graylog2-server6.2.0 to before 6.3.12; 7.0.0-alpha.1 to before 7.0.7; 7.1.0-alpha.1 to before 7.1.26.3.12, 7.0.7, 7.1.2Patch availableCNA
—org.graylog2:graylog2-server (Maven)6.2.0 to before 6.3.126.3.12Patch availableGHSA-j769-9gv9-65gr
—org.graylog2:graylog2-server (Maven)7.0.0 to before 7.0.77.0.7Patch availableGHSA-j769-9gv9-65gr
—org.graylog2:graylog2-server (Maven)7.1.0 to before 7.1.27.1.2Patch availableGHSA-j769-9gv9-65gr
  • graylog2-server VendorGraylog2 Affected 6.2.0 to before 6.3.12; 7.0.0-alpha.1 to before 7.0.7; 7.1.0-alpha.1 to before 7.1.2 Fixed in 6.3.12, 7.0.7, 7.1.2 Patch available CNA
  • org.graylog2:graylog2-server (Maven) Vendor— Affected 6.2.0 to before 6.3.12 Fixed in 6.3.12 Patch available GHSA-j769-9gv9-65gr
  • org.graylog2:graylog2-server (Maven) Vendor— Affected 7.0.0 to before 7.0.7 Fixed in 7.0.7 Patch available GHSA-j769-9gv9-65gr
  • org.graylog2:graylog2-server (Maven) Vendor— Affected 7.1.0 to before 7.1.2 Fixed in 7.1.2 Patch available GHSA-j769-9gv9-65gr

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:graylog:graylog:*:*:*:*:*:*:*:*——Graylog2
  • cpe:2.3:a:graylog:graylog:*:*:*:*:*:*:*:* Versions — — ·Graylog2

Remediation

  • Fix · CNA graylog2-server (Graylog2) Fixed in 6.3.12, 7.0.7, 7.1.2
  • Fix · GHSA-j769-9gv9-65gr org.graylog2:graylog2-server (Maven) Fixed in 6.3.12 Advisory →
  • Fix · GHSA-j769-9gv9-65gr org.graylog2:graylog2-server (Maven) Fixed in 7.0.7 Advisory →
  • Fix · GHSA-j769-9gv9-65gr org.graylog2:graylog2-server (Maven) Fixed in 7.1.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55867
  2. 2026-10-03 Alias added: GHSA-j769-9gv9-65gr

References

Other 10

  • TI-2024-16341 graylog2-server vulnerable to instantiation of arbitrary classes triggered by API request CVSS 3.1HIGH 8.8
  • TI-2023-21671 Insecure source port usage for DNS queries in Graylog CVSS 3.1MEDIUM 5.3
  • TI-2026-01133 Incorrect management of session invalidation vulnerability in Graylog Web Interface CVSS 4.0CRITICAL 9.3
  • TI-2023-21667 User session is still usable after logout in graylog2-server CVSS 3.1LOW 3.1
  • TI-2021-15624 A Session ID leak in the audit log in Graylog before 4.1.2 allows attackers to escalate… CVSS 3.1CRITICAL 9.8
  • TI-2021-15623 A Session ID leak in the DEBUG log file in Graylog before 4.1.2 allows attackers to… CVSS 3.1CRITICAL 9.8
See all 27 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences