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SyntaxHighlight GeSHi CVE-2026-58030

| EUVDEUVD-2026-41018 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-07-01 wikimedia-foundation GHSA-vmx6-3fp5-595p
XSS PHP Syntaxhighlight Geshi
5.3
CVSS 4.0 · Vendor: wikimedia-foundation
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Severity by source

Vendor (wikimedia-foundation) PRIMARY
5.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/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
vuln.today AI
5.4 MEDIUM

Network XSS requiring low-privilege auth; victim must load page (UI:R); scope changes to victim browser; minor confidentiality and integrity impact.

3.1 AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (wikimedia-foundation).

CVSS VectorVendor: wikimedia-foundation

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

2
Patch available
Jul 01, 2026 - 17:01 EUVD
Analysis Generated
Jul 01, 2026 - 16:03 vuln.today

DescriptionCVE.org

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation SyntaxHighlight_GeSHi.

This vulnerability is associated with program files includes/SyntaxHighlight.Php.

This issue affects SyntaxHighlight_GeSHi: from * before 1.46.0, 1.45.4, 1.44.6, 1.43.9.

AnalysisAI

Cross-site scripting in the Wikimedia Foundation SyntaxHighlight_GeSHi MediaWiki extension allows authenticated users to inject unsanitized input via the syntax highlighting interface, with malicious script executing in victims' browsers upon page view. The flaw originates in includes/SyntaxHighlight.php and affects all versions prior to branch-specific fixes at 1.46.0, 1.45.4, 1.44.6, and 1.43.9. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate with low-privilege wiki account
Delivery
Edit or create page with malicious SyntaxHighlight tag
Exploit
Payload stored in wiki page via SyntaxHighlight.php
Execution
Victim user views affected page
Persist
Unsanitized script executes in victim's browser
Impact
Attacker exfiltrates session data or performs client-side actions
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Vulnerability AssessmentAI

Exploitation Exploitation requires a low-privilege authenticated account on the target MediaWiki instance (confirmed by PR:L in the CVSS 4.0 vector). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N) scores 5.3, reflecting a medium-severity, network-reachable flaw requiring only low-privilege authentication with no attack complexity or special conditions. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An authenticated wiki editor crafts a malicious code block using the SyntaxHighlight parser tag, embedding JavaScript that is not properly escaped by SyntaxHighlight.php. When any other user views the page containing the syntax-highlighted block, the injected script executes in their browser, potentially enabling session cookie theft, phishing overlays, or other client-side attacks. …
Remediation Upgrade SyntaxHighlight_GeSHi to the branch-appropriate patched release: 1.46.0 (for MediaWiki 1.46 deployments), 1.45.4 (for 1.45), 1.44.6 (for 1.44), or 1.43.9 (for 1.43). … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-58030 vulnerability details – vuln.today
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