Semantic MediaWiki has reflected XSS in `Special:SearchByProperty` (`property` and `value` parameters) — GHSA-59XW-QV23-J3RC

Summary

#### Failure mode The `value` parameter was reflected back into rendered output and error messaging paths without enough output-context encoding. #### Remediation - The form value is escaped before it is placed back into the input field. - Derived error messages are also escaped before being rendered into HTML. #### Maintenance note Do not treat error text as trusted just because it originated from validation.…

Timeline

Published by source

2026-09-18

Risk context

• Reported severity or threat level: medium.
• Reported CVSS score: 6.1 out of 10.
• Review exposure for the affected product or family: composer: mediawiki/semantic-media-wiki.

Product

composer: mediawiki/semantic-media-wiki

What to do

General, cautious steps (verify details in the official source):

• Review exposure and plan remediation based on risk and environment.
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

Evidence and provenance

Canonical advisory ID

GHSA-59XW-QV23-J3RC

Source

GitHub

Vendor

GitHub

Published by source

2026-09-18

Last source activity

2026-09-18

Additional identifiers

CVE-2026-77608

Curated by

hlukh.ch

Related advisories and connections

These advisories are connected by shared CVE, product, vendor, source, or time signals.