Is CVE-2026-77607 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-77607 being exploited in the wild.

How severe is CVE-2026-77607?

Medium severity, with a CVSS score of 6.1, published 18 September 2026.

Which products and versions are affected?

mediawiki/semantic-media-wiki (Packagist) <= 7.1.0, ECOSYSTEM:introduced=0,fixed=7.2.0; Semantic MediaWiki <= 7.1.0.

Is there a fix for CVE-2026-77607?

Yes. mediawiki/semantic-media-wiki (Packagist): upgrade to 7.2.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-77607 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-77607?

Check whether you run mediawiki/semantic-media-wiki (Packagist) or Semantic MediaWiki at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-77607: Semantic MediaWiki reflected XSS in Special:Ask separator parameter

Q: Is there a fix for CVE-2026-77607?

Yes. mediawiki/semantic-media-wiki (Packagist): upgrade to 7.2.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-77607 attacked?

It is attacked over the network, in a software library.

Q: Am I affected by CVE-2026-77607?

Check whether you run mediawiki/semantic-media-wiki (Packagist) or Semantic MediaWiki at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-77607 · Severity: medium · CVSS 6.1 · Published 2026-09-18

Semantic MediaWiki is a semantic search extension for MediaWiki that allows structured querying of wiki content. A reflected cross-site scripting (XSS) vulnerability in the `sep` parameter of the Special:Ask page allows unauthenticated attackers to inject arbitrary HTML and JavaScript into the page, potentially stealing user session cookies, defacing content, or performing actions on behalf of authenticated users.

Technologies: mediawiki/semantic-media-wiki (Packagist), Semantic MediaWiki. Vendors: Packagist, Semantic MediaWiki.

Quick answers

Is CVE-2026-77607 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-77607 being exploited in the wild.
How severe is CVE-2026-77607?: Medium severity, with a CVSS score of 6.1, published 18 September 2026.
Which products and versions are affected?: mediawiki/semantic-media-wiki (Packagist) <= 7.1.0, ECOSYSTEM:introduced=0,fixed=7.2.0; Semantic MediaWiki <= 7.1.0.
Is there a fix for CVE-2026-77607?: Yes. mediawiki/semantic-media-wiki (Packagist): upgrade to 7.2.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-77607 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-77607?: Check whether you run mediawiki/semantic-media-wiki (Packagist) or Semantic MediaWiki at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

mediawiki/semantic-media-wiki (Packagist): upgrade to 7.2.0 or later
```
composer require mediawiki/semantic-media-wiki:^7.2.0
```

Technical details

The vulnerability is a reflected XSS flaw (CWE-79) in the Special:Ask query interface where the table separator (`sep`) parameter is inserted verbatim into generated HTML without sanitization. An attacker can craft a URL with malicious HTML/JavaScript in the `sep` parameter; when a user visits this link, the payload executes in their browser. The vulnerability is reachable without authentication for both normal HTML output and raw request mode (`request_type=raw`). The fix (version 7.2.0) escapes the `sep` parameter in all non-wiki output modes while preserving safe variants like `<br>` tags for legitimate line-break separators.

Affected products

Semantic MediaWiki Semantic MediaWiki <= 7.1.0

Identifiers

CVE-2026-77607
GHSA-7xv3-gf2g-498h

Timeline

2026-07-18: disclosed
2026-07-18: patched: Version 7.2.0 released
2026-09-18: advisory

References

https://api.github.com/users/krabina

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