CVE-2026-66400

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.23% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 14.8% of scored records. A rank, not a probability.

NVD base score

6.3 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/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

NVD analysis status

Deferred. NVD last modified this record on 2026-10-23.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-07-29 13:32Z3 MO AGO

Last updated

2026-07-29 14:47Z3 MO AGO

Reserved

2026-07-26

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

Medium (CVSS 6.3)

CNA CVSS vector

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Weaknesses

• CWE-613Insufficient Session ExpirationBase

Data version

5.2

Document digest

d84bbf419f0a9c57a6ecef421226c69dc8c4fc97eed231445ecdf93fdcc3b7a3

• github.comGitHub Security Advisory (GHSA-mj78-8gwc-vxjj)https://github.com/getgrav/grav/security/advisories/GHSA-mj78-8gwc-vxjjvendor-advisory
• www.vulncheck.comVulnCheck Advisory: Grav Login Plugin before 3.8.13 Insufficient Session Expirationhttps://www.vulncheck.com/advisories/grav-login-plugin-before-insufficient-session-expirationthird-party-advisory