CVE-2026-5921

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 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

0.42% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 35.3% 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:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/E:P/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 2026-06-17.

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

2026-04-21 22:11Z4 MO AGO

Last updated

2026-04-22 13:18Z4 MO AGO

Reserved

2026-04-08

Assigning CNA

GitHub_P

Record state

PUBLISHED

Severity

High (CVSS 8.9)

CNA CVSS vector

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

Weaknesses

• CWE-918Server-Side Request Forgery (SSRF)Base

Data version

5.2

Document digest

a13dea3a55548ed2ec11cd312304435c132fbb1f12c96770bd4dd446cf42cf47

• docs.github.comhttps://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.26release-notes
• docs.github.comhttps://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.21release-notes
• docs.github.comhttps://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.17release-notes
• docs.github.comhttps://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.14release-notes
• docs.github.comhttps://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.8release-notes
• docs.github.comhttps://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.5release-notes
• docs.github.comhttps://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.1release-notes