CVE-2026-66878

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• 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

0.27% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 19.3% of scored records. A rank, not a probability.

NVD base score

7.7 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

NVD analysis status

Awaiting Analysis. NVD last modified this record on 2026-08-27.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

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

2026-08-12 01:10Z23 DAYS AGO

Last updated

2026-08-27 02:16Z8 DAYS AGO

Reserved

2026-08-11

Assigning CNA

redhat

Record state

PUBLISHED

Severity

High (CVSS 7.7)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Weaknesses

• CWE-639Authorization Bypass Through User-Controlled KeyBase

Data version

5.2

Document digest

25e5dd0dbf136bcc0ef3cdb44e1effc8cf7328334b35e2aa2e9beade6a980f00

• access.redhat.comRHSA-2026:60386https://access.redhat.com/errata/RHSA-2026:60386vendor-advisoryx_refsource_REDHAT
• access.redhat.comRHSA-2026:60387https://access.redhat.com/errata/RHSA-2026:60387vendor-advisoryx_refsource_REDHAT
• access.redhat.comRHSA-2026:60388https://access.redhat.com/errata/RHSA-2026:60388vendor-advisoryx_refsource_REDHAT
• access.redhat.comRHSA-2026:60389https://access.redhat.com/errata/RHSA-2026:60389vendor-advisoryx_refsource_REDHAT
• access.redhat.comRHSA-2026:60390https://access.redhat.com/errata/RHSA-2026:60390vendor-advisoryx_refsource_REDHAT
• access.redhat.comRHSA-2026:60391https://access.redhat.com/errata/RHSA-2026:60391vendor-advisoryx_refsource_REDHAT
• access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-66878vdb-entryx_refsource_REDHAT
• bugzilla.redhat.comRHBZ#2514226https://bugzilla.redhat.com/show_bug.cgi?id=2514226issue-trackingx_refsource_REDHAT