YesWiki: SQL injection in Bazar filtertags action
Summary
YesWiki before 4.6.7 contains an SQL injection flaw in the Bazar filtertags action, where filterN tag tokens are concatenated unescaped into an SQL IN clause. On default installs an unauthenticated attacker can save crafted filtertags markup in a page and use a MySQL backslash-escape breakout with a UNION subquery to read arbitrary database tables, such as password hashes. Installs that restrict page write access require an account with page write rights, which lowers the risk.
Affected
- YesWiki (Composer yeswiki/yeswiki) versions up to and including 4.6.6 according to the GitHub advisory; the CNA record lists all versions before 4.6.7.
- Older branches were not verified; treat every version below 4.6.7 as affected.
Fixed in
- Upgrade to YesWiki 4.6.7.
Workaround
- No vendor workaround known.
- Until the upgrade is done, restrict who can create or edit wiki pages and review existing pages for unusual filtertags markup.
Exploitation
- No exploitation in the wild known; not listed in CISA KEV.
- CISA SSVC: exploitation 'poc', automatable 'yes', technical impact 'partial'.
- The GitHub advisory contains a working proof of concept.
- EPSS 0.00281.
Our recommendation
- Upgrade all YesWiki instances below 4.6.7 to 4.6.7 as a priority, especially internet-facing ones.
- Check existing pages for unexpected filtertags markup and review admin and user accounts for unauthorised changes.
- If an instance was exposed while vulnerable, rotate user and admin passwords after patching.
- Restrict page edit rights to trusted users until patched.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- GitHub Security Advisory GHSA-p87r-f4x4-8r4g github.com
- VulnCheck advisory: YesWiki before 4.6.7 SQL Injection via filtertags filterN parameter www.vulncheck.com
- YesWiki v4.6.7 release github.com
- OSV: CVE-2026-104457 osv.dev
- Vulners: CVE-2026-104457 vulners.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 31 Oct 2026, 22:50.
Original description (NVD)
YesWiki before 4.6.7 contains an SQL injection vulnerability in the Bazar filtertags action, which wraps unescaped filterN attribute tokens in quotes and concatenates them into a raw tags.value IN (...) clause. Unauthenticated attackers on default installs can save filtertags markup in a page with a trailing-backslash token that breaks quote parity under MySQL backslash escaping. This lets them inject a five-column UNION subquery to read arbitrary table data such as password hashes.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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