CVE-2026-77254

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.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• 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

0.62% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 49.3% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Analyzed. NVD last modified this record on 2026-09-28.

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

2026-09-22 18:11Z1 MO AGO

Last updated

2026-09-22 19:04Z1 MO AGO

Reserved

2026-08-20

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Critical (CVSS 9.1)

CNA CVSS vector

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

Weaknesses

• CWE-306Missing Authentication for Critical FunctionBase

Data version

5.2

Document digest

f7caa4f3c4edc8e818f63909e86fcda8b7ef1945d1f92a09422cafb2104f29cc

• github.comhttps://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-vc8m-84rp-53hxx_refsource_CONFIRM
• github.comhttps://github.com/sooperset/mcp-atlassian/pull/1448x_refsource_MISC
• github.comhttps://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460x_refsource_MISC
• github.comhttps://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0x_refsource_MISC