CVE-2026-77610Public exploitNetwork attack vector

Reflected XSS via unescaped query debug output

Published Sep 18, 2026 · Updated Sep 18, 2026

Reflected XSS in Semantic MediaWiki before 7.2.0 allows remote attackers to execute script in a visitor's browser via Special:Ask. SMW\Query\DebugFormatter sends re-serialized query strings, SQL, and PostgreSQL EXPLAIN text to OutputPage::addHTML without HTML-context encoding. Exploitation requires a victim to open a crafted anonymous request whose query condition targets a text/blob property, including built-in _txt properties.

CVSS severity6.1
Medium
EPSS probability0.28%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Semantic MediaWiki before 7.2.0 allows remote attackers to execute script in a visitor's browser via Special:Ask. SMW\Query\DebugFormatter sends re-serialized query strings, SQL, and PostgreSQL EXPLAIN text to OutputPage::addHTML without HTML-context encoding. Exploitation requires a victim to open a crafted anonymous request whose query condition targets a text/blob property, including built-in _txt properties.

The record

CVE
CVE-2026-77610
Published
Sep 18, 2026
Updated
Sep 18, 2026
Vendor
Semantic MediaWiki
Product
Semantic MediaWiki
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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=< 7.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Semantic MediaWiki · Semantic MediaWikiversion=< 7.2.0

Published CVSS scores

6.1GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

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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