CVE-2026-10585Network attack vector

Authenticated JavaScript execution via unescaped Discussion titles

Published Jun 30, 2026 · Updated Jun 30, 2026

Stored XSS in GitHub Enterprise Server 3.16 through 3.20 releases allows remote authenticated users to execute JavaScript in another user's browser. AnsweredQuestionStructuredDataComponent places an unescaped Q&A Discussion title into JSON-LD, letting the title terminate the script block. A Discussion comment must be marked as the answer and another user must view the page; a REST API JSONP callback bypasses the content security policy.

CVSS severity6.3
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in GitHub Enterprise Server 3.16 through 3.20 releases allows remote authenticated users to execute JavaScript in another user's browser. AnsweredQuestionStructuredDataComponent places an unescaped Q&A Discussion title into JSON-LD, letting the title terminate the script block. A Discussion comment must be marked as the answer and another user must view the page; a REST API JSONP callback bypasses the content security policy.

The record

CVE
CVE-2026-10585
Published
Jun 30, 2026
Updated
Jun 30, 2026
Vendor
Twitter
Product
GitHub Enterprise Server
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=3.17.0 <=3.17.16 changes=[{"at":"3.17.17","status":"unaffected"}]
  2. Affected versionversion=3.18.0 <=3.18.10 changes=[{"at":"3.18.11","status":"unaffected"}]
  3. Affected versionversion=3.19.0 <=3.19.7 changes=[{"at":"3.19.8","status":"unaffected"}]
  4. Affected versionversion=3.20.0 <=3.20.3 changes=[{"at":"3.20.4","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Twitter · GitHub Enterprise Serverversion=3.17.0 <=3.17.16 changes=[{"at":"3.17.17","status":"unaffected"}]; version=3.18.0 <=3.18.10 changes=[{"at":"3.18.11","status":"unaffected"}]; version=3.19.0 <=3.19.7 changes=[{"at":"3.19.8","status":"unaffected"}]; version=3.20.0 <=3.20.3 changes=[{"at":"3.20.4","status":"unaffected"}]

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
6.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:H/SI:H/SA: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')
T1059.007Command and Scripting Interpreter: JavaScript

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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