Security Resilience

CVE-2026-109321

Public PoC
Published
12 October 2026
Modified
15 October 2026
CVSS Score v4 9.3
Click a component to see what it means
Raw vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0040 33th percentile
Risk Priority 45 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2026-109321 is a critical-severity Use of Weak Credentials (CWE-1391) vulnerability. Its CVSS base score is 9.3 (Critical).

Operationally, ranked at the 33th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

OWASP Top 10 for Web (2025)

EU & UK References

Vulnerability Data

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…

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or guess a provider identifier can reproduce these credentials and log in, gaining administrative control of privileged accounts.

CWE(s)

Related Threats

CVEs Like This One

CVE-2025-4057Shared CWE-1391
CVE-2025-59103Shared CWE-1391
CVE-2025-6077Shared CWE-1391
CVE-2025-55584Shared CWE-1391
CVE-2026-24449Shared CWE-1391
CVE-2025-6737Shared CWE-1391
CVE-2024-42027Shared CWE-1391
CVE-2024-42051Shared CWE-1391
CVE-2025-32471Shared CWE-1391
CVE-2025-35970Shared CWE-1391

Affected Assets

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

addresses: CWE-1391

Ensuring sufficient strength of mechanism for authenticators prevents use of weak credentials.

addresses: CWE-1391

Enforces use of credentials that comply with standards rather than weak credentials for module access.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

blocks

A.5.17 mandates generation of non-guessable unique credentials, immediate change of defaults/temporary secrets, strong password enforcement, no reuse, blocking of compromised passwords, and secure transmission/storage; this stops exploitation of weak/guessable/default credentials for most but not all cases in CWE-1391 (e.g. leaves some non-password credential forms or post-compromise reuse outside its explicit scope).

degrades

Restricts privileged accounts but does not explicitly address default or hard-coded credentials for those accounts.

blocks

Requires security activities throughout the SDLC that can catch weak credentials, but does not mandate their elimination.

prevents

Secure-coding rules can prohibit hard-coded passwords, yet coverage depends on specific coding standards adopted.

finds

Security testing can discover weak credentials, but does not guarantee they are prevented by design.

blocks

A.8.5 mandates strong, multi-factor, non-guessable authentication techniques (with brute-force protection, no cleartext, etc.) that stop weak credentials from being successfully exploited; the bounded remainder is hard-coded/default credentials inside non-interactive product components where no human or session authentication occurs at all.

Hardening callouts derived

DISA STIG baselines are authored against specific weaknesses. Where this CVE cites a broad weakness class, the mapping is not asserted at that abstraction (owner ruling, 2026-09-25: grade only at Base and below), so no rule is shown here rather than a rule shown against the wrong grain.

  • No fine-grained STIG row for CWE-1391, a class-level weakness. Rules are authored against its narrower children: CWE-521.

References