# CVE-2026-104457: YesWiki SQL injection in Bazar filtertags action

Source: https://junglewise.ai/threats/cve-2026-104457-yeswiki-before-4-6-7-contains-an-sql-injection-vulnerability-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-02. Updated: 2026-10-05  
License: CC BY 4.0 with a link back

CVE-2026-104457 · Severity: high · CVSS 8.6 · Published 2026-10-02

YesWiki is a wiki platform that allows collaborative content creation and management. The Bazar filtertags feature, used to filter and display tagged content, contains an SQL injection vulnerability that allows unauthenticated attackers on default installations to execute arbitrary SQL queries and extract sensitive data such as password hashes. An attacker can save a specially crafted wiki page with malicious markup that exploits MySQL's backslash-escaping behavior to break out of the intended SQL query structure.

Technologies: [YesWiki](https://junglewise.ai/threats/technologies/yeswiki). Vendors: [YesWiki](https://junglewise.ai/threats/vendors/yeswiki).

## Quick answers

**Is CVE-2026-104457 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-104457 being exploited in the wild.

**How severe is CVE-2026-104457?** High severity, with a CVSS score of 8.6, published 2 October 2026.

**Which products and versions are affected?** YesWiki before 4.6.7.

**Is there a fix for CVE-2026-104457?** Yes: fixed in 4.6.7. Until then: Set default_write_acl to restrict page creation and editing to authenticated users only, preventing unauthenticated attackers from saving malicious filtertags markup on a default install. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-104457 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-104457?** Check whether you run YesWiki 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

- Fixed in 4.6.7

Set default_write_acl to restrict page creation and editing to authenticated users only, preventing unauthenticated attackers from saving malicious filtertags markup on a default install.

## Technical details

The filtertags action in tools/bazar/actions/filtertags.php concatenates user-supplied filterN parameters directly into a raw SQL tags.value IN (...) clause without proper escaping or parameterization. The _convert() function on UTF-8 MySQL instances is a passthrough and does not escape special characters. An attacker can inject a trailing backslash in a filter token to flip quote parity under MySQL's default sql_mode (with backslash-escapes enabled), allowing injection of a five-column UNION subquery to read arbitrary table data.

## Affected products

- YesWiki YesWiki before 4.6.7

## Timeline

- 2026-09-01: disclosed
- 2026-10-02: advisory

## References

- [https://github.com/YesWiki/yeswiki/security/advisories/GHSA-p87r-f4x4-8r4g](https://github.com/YesWiki/yeswiki/security/advisories/GHSA-p87r-f4x4-8r4g)
- [https://www.vulncheck.com/advisories/yeswiki-before-4.6.7-sql-injection-via-filtertags-filtern-parameter](https://www.vulncheck.com/advisories/yeswiki-before-4.6.7-sql-injection-via-filtertags-filtern-parameter)

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