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Public proof of conceptFix available

CVE-2025-12420

A public proof of concept exists; no exploitation attested.

  • Published2026-01-12
  • Fixed in5.2.19 · 5.1.18
  • WeaknessCWE-250

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A vulnerability has been identified in the ServiceNow AI Platform that could enable an unauthenticated user to impersonate another user and perform the operations that the impersonated user is entitled to perform. ServiceNow has addressed this vulnerability by deploying a relevant security update to  hosted instances in October 2025. Security updates have also been provided to ServiceNow self-hosted customers, partners, and hosted customers with unique configurations. Additionally, the vulnerability is addressed in the listed Store App versions. We recommend that customers promptly apply an appropriate security update or upgrade if they have not already done so.

Timeline

dates in UTC
  1. 2026-01-1222:16CVE publishedNVD

Versions per branch

NVD
Servicenow now assist ai agents
BranchAffectedFixed in
5.2≥ 5.2.0, < 5.2.195.2.19
5.1< 5.1.185.1.18
Servicenow virtual agent api
BranchAffectedFixed in
4.0≥ 4.0.0, < 4.0.44.0.4
3.15< 3.15.23.15.2

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA2 products

As SN, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • ServiceNow Now Assist AI Agentsother versions: not affected
    Affected
    • ≥ 5.0.26, ≤ 5.1.17no fix statedsemver
    • ≥ 5.0.26, ≤ 5.2.18no fix statedsemver
  • ServiceNow Virtual Agent APIother versions: not affected
    Affected
    • < 3.15.2fixed in 3.15.2semver
    • < 4.0.4fixed in 4.0.4semver

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-01-13

Fix

  1. Update Servicenow now assist ai agents to 5.2.19 · 5.1.18

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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:N/AU:Y/R:U/V:C/RE:H/U:Amber
Published
2026-01-12
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-mwg5-cwh8-88m5

Frequently asked questions

What is CVE-2025-12420?

A vulnerability has been identified in the ServiceNow AI Platform that could enable an unauthenticated user to impersonate another user and perform the operations that the impersonated user is entitled to perform. ServiceNow has addressed this vulnerability by deploying a relevant security update to  hosted instances in October 2025. Security updates have also been provided to ServiceNow self-hosted customers, partners, and hosted customers with unique configurations. Additionally, the vulnerability is addressed in the listed Store App versions. We recommend that customers promptly apply an appropriate security update or upgrade if they have not already done so.

Is CVE-2025-12420 actively exploited?

Active exploitation of CVE-2025-12420 has not been confirmed. Its EPSS score was 53.2% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-12420?

CVE-2025-12420 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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