CVE-2026-43639

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 ImpacttotalSuccessful exploitation gives total 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

0.59% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 48.1% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

Analyzed. NVD last modified this record on 2026-10-26.

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

2026-05-11 17:14Z5 MO AGO

Last updated

2026-07-14 20:01Z3 MO AGO

Reserved

2026-05-01

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

High (CVSS 8.9)

CNA CVSS vector

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

Weaknesses

• CWE-862Missing AuthorizationClass

Data version

5.2

Document digest

d6bd7e940544ffcdfc3084e161d100751f5a8ffedd8716689adc75fcd156344c

• sanjokkarki.com.nphttps://sanjokkarki.com.np/blog/bitwarden-provider-takeovertechnical-descriptionexploit
• github.comhttps://github.com/bitwarden/server/releases/tag/v2026.4.0release-notes
• github.comhttps://github.com/bitwarden/server/pull/7372issue-tracking
• github.comhttps://github.com/bitwarden/server/commit/0918bfdda6f5eec391c69bd9074f6aef4eac0b1dpatch
• www.vulncheck.comhttps://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-provider-clientsthird-party-advisory