CVE-2026-88257

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

0.26% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 18.7% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/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 2026-10-08.

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

2026-10-08 13:40Z21 DAYS AGO

Last updated

2026-10-08 14:09Z21 DAYS AGO

Reserved

2026-10-07

Assigning CNA

EEF

Record state

PUBLISHED

Severity

Medium (CVSS 5.3)

CNA CVSS vector

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

Weaknesses

• CWE-20Improper Input ValidationClass

Data version

5.2

Document digest

d636f50b3154f89828dc5e8f4b5275dba14955c0009e33093e99ae2dd7d6375d

• github.comGitHub Advisoryhttps://github.com/ScriptKittyOS/beam_mcp/security/advisories/GHSA-mrg2-4747-fmpwrelatedvendor-advisory
• cna.erlef.orgEEF CNA record for CVE-2026-88257https://cna.erlef.org/cves/CVE-2026-88257.htmlrelated
• osv.devOSV record EEF-CVE-2026-88257https://osv.dev/vulnerability/EEF-CVE-2026-88257related
• github.comIntroducing commit 083838e in ScriptKittyOS/beam_mcphttps://github.com/ScriptKittyOS/beam_mcp/commit/083838eb8e17fe5f6fcaf761bdbe203110288b0brelated
• github.comFix commit 289dbdb in ScriptKittyOS/beam_mcphttps://github.com/ScriptKittyOS/beam_mcp/commit/289dbdbad641943b29a3b8d1eb36506cc8cec10apatch