CVE-2026-77609Network attack vector

Open redirect via unchecked URIResolver target

Published Sep 18, 2026 · Updated Sep 18, 2026

Open redirect in Semantic MediaWiki 7.1.0 and earlier allows remote attackers to send users to attacker-controlled sites. Special:URIResolver converts a user-controlled subpage into a MediaWiki title, then sends an HTTP 303 to getFullURL() without checking the final host or embedded authority credentials. Exploitation requires a user to follow the crafted trusted-wiki URL; the resulting off-host navigation enables phishing under the wiki's apparent trust.

CVSS severity6.1
Medium
EPSS probability0.27%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in Semantic MediaWiki 7.1.0 and earlier allows remote attackers to send users to attacker-controlled sites. Special:URIResolver converts a user-controlled subpage into a MediaWiki title, then sends an HTTP 303 to getFullURL() without checking the final host or embedded authority credentials. Exploitation requires a user to follow the crafted trusted-wiki URL; the resulting off-host navigation enables phishing under the wiki's apparent trust.

The record

CVE
CVE-2026-77609
Published
Sep 18, 2026
Updated
Sep 18, 2026
Vendor
Semantic MediaWiki
Product
Semantic MediaWiki
Classifications
CWE-601, T1566.002
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

6.1GitHub Advisory DatabaseCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1566.002Spearphishing Link

Public exploit references

No public exploit references are available in this record.

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Technologies

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Your stack

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