CVE-2026-58030Network attack vector

Stored XSS via unescaped linelinks value

Published Jul 1, 2026 · Updated Jul 1, 2026

Stored XSS in Wikimedia SyntaxHighlight allows remote authenticated users to run script in readers' browsers via crafted linelinks values. includes/SyntaxHighlight.php forwards the unescaped, user-controlled linelinks attribute to Pygments, which embeds it as an HTML line-anchor prefix. Page-editing access is required, and viewing the stored highlighted block executes attacker-controlled script in the reader's origin.

CVSS severity5.3
Medium
EPSS probability0.27%
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 Wikimedia SyntaxHighlight allows remote authenticated users to run script in readers' browsers via crafted linelinks values. includes/SyntaxHighlight.php forwards the unescaped, user-controlled linelinks attribute to Pygments, which embeds it as an HTML line-anchor prefix. Page-editing access is required, and viewing the stored highlighted block executes attacker-controlled script in the reader's origin.

The record

CVE
CVE-2026-58030
Published
Jul 1, 2026
Updated
Jul 1, 2026
Vendor
Wikimedia Foundation
Product
SyntaxHighlight
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 1, 2026Record 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=* <1.46.0, 1.45.4, 1.44.6, 1.43.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Wikimedia Foundation · SyntaxHighlightversion=* <1.46.0, 1.45.4, 1.44.6, 1.43.9

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.3Wikimedia FoundationCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/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')
T1189Drive-by Compromise

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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