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TI-2026-71137 Aliases CVE-2026-109321GHSA-9qx4-jr52-5c2w

Predictable credentials in Grav Login OAuth plugin enable login bypass

Priority MEDIUM 48CWE-1391Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

The Grav Login OAuth plugin (grav-plugin-login-oauth) from 1.0.0-beta.1 before 1.4.3 creates accounts for OAuth users as ordinary Grav users with a predictable username and an unsalted MD5 hash of the provider identifier as the password. Password login stays enabled, so the credentials can be recomputed by anyone who knows or guesses a provider identifier. An unauthenticated remote attacker can log in with these credentials and gain administrative control of privileged accounts, using weak credentials (CWE-1391).

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

Grav Login OAuth plugin (grav-plugin-login-oauth) before 1.4.3 provisions OAuth accounts as ordinary Grav users with a deterministic <provider>.<id> username and an unsalted MD5 hash of the provider identifier as the password, without disabling password login. Unauthenticated remote attackers who learn or guess a provider identifier can reproduce these credentials and log in, gaining administrative control of privileged accounts.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00402 34th percentileScored 2026-11-07
Fix Fixed grav-plugin-login-oauth (getgrav): 1.4.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
getgravgrav-plugin-login-oauth1.0.0-beta.1 to before 1.4.31.4.3Patch availableCNA
  • grav-plugin-login-oauth Vendorgetgrav Affected 1.0.0-beta.1 to before 1.4.3 Fixed in 1.4.3 Patch available CNA

Remediation

Update grav-plugin-login-oauth to version 1.4.3 or later, which fixes the issue.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA grav-plugin-login-oauth (getgrav) Fixed in 1.4.3

Timeline

  1. 2026-10-12 Threatist record created from CVE-2026-109321
  2. 2026-10-12 Alias added: GHSA-9qx4-jr52-5c2w
  3. 2026-10-18 CISA SSVC decision points changed

References

Advisory 1

  • TI-2026-30893 Grav: Privilege Escalation via Missing Server-Side Validation of groups/access CVSS 3.1CRITICAL 9.4
  • TI-2025-28971 Cross Site Scripting vulnerability in grav v.1.7.48 and before allows an attacker to… CVSS 3.1CRITICAL 9.8
  • TI-2021-04523 Unauthenticated Arbitrary YAML Write/Update leads to Code Execution CVSS 3.1CRITICAL 9.8
  • TI-2026-50940 Grav CMS before 2.0.16 Origin Validation Bypass via Referer CVSS 4.0CRITICAL 9.3
  • TI-2026-46446 Grav before 2.0.7 Remote Code Execution via Blueprint dynamicData CVSS 4.0CRITICAL 9.3
  • TI-2021-22428 GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticated) (2) CVSS 4.0CRITICAL 9.3
See all 228 →

Sources

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