CVE-2025-3246Network attack vector

Privileged-user XSS via Markdown math block escaping

Published Apr 17, 2025 · Updated Apr 18, 2025

Cross-site scripting in GitHub Enterprise Server 3.16.1 allows remote authenticated users to execute script via Markdown math blocks. The Markdown renderer permits dollar-delimited math blocks to escape early and fails to escape non-wrapped content, allowing malicious HTML or CSS into the rendered page. Exploitation requires instance access and a privileged user to interact with the malicious element, exposing browser-accessible data and actions.

CVSS severity8.6
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in GitHub Enterprise Server 3.16.1 allows remote authenticated users to execute script via Markdown math blocks. The Markdown renderer permits dollar-delimited math blocks to escape early and fails to escape non-wrapped content, allowing malicious HTML or CSS into the rendered page. Exploitation requires instance access and a privileged user to interact with the malicious element, exposing browser-accessible data and actions.

The record

CVE
CVE-2025-3246
Published
Apr 17, 2025
Updated
Apr 18, 2025
Vendor
Twitter
Product
GitHub Enterprise Server
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 18, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.16 <=3.16.1 changes=[{"at":"3.16.2","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Twitter · GitHub Enterprise Serverversion=3.16 <=3.16.1 changes=[{"at":"3.16.2","status":"unaffected"}]

Published CVSS scores

8.6GitHub, Inc. (Products Only)CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:A/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
7.6NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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