# CVE-2026-116822: YesWiki path traversal in BazarListeAction template parameter

Source: https://junglewise.ai/threats/cve-2026-116822-yeswiki-before-4-7-0-contains-a-path-traversal-vulnerability-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-27. Updated: 2026-10-27  
License: CC BY 4.0 with a link back

CVE-2026-116822 · Severity: medium · CVSS 5.3 · Published 2026-10-27

YesWiki is a wiki engine for building collaborative websites. An unauthenticated attacker can modify how Bazar (a data management tool within YesWiki) entries are displayed by appending a crafted template parameter to any page URL, forcing the page to render with an arbitrary layout from the application's template directory. This results in page defacement visible to all visitors who follow the manipulated link.

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

## Quick answers

**Is CVE-2026-116822 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-116822 being exploited in the wild.

**How severe is CVE-2026-116822?** Medium severity, with a CVSS score of 5.3, published 27 October 2026.

**Which products and versions are affected?** YesWiki before 4.7.0.

**Is there a fix for CVE-2026-116822?** Yes: fixed in 4.7.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-116822 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-116822?** 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 4.7.0

## Technical details

BazarListeAction accepts a template parameter from the HTTP GET query string and applies only htmlspecialchars() sanitization, which does not filter path traversal sequences (../) or validate template names. The unsanitized parameter flows into Twig's template renderer with the @bazar namespace prefix. Although Twig's validateName() function prevents escape from the @bazar namespace (filesystem access is blocked), an attacker can select any template within that namespace without authentication or user interaction.

## Affected products

- YesWiki YesWiki before 4.7.0

## Timeline

- 2026-10-12: disclosed
- 2026-10-12: patched: 4.7.0 released

## References

- [https://github.com/YesWiki/yeswiki/security/advisories/GHSA-qfv2-x8g4-qg27](https://github.com/YesWiki/yeswiki/security/advisories/GHSA-qfv2-x8g4-qg27)
- [https://www.vulncheck.com/advisories/yeswiki-before-4.7.0-template-traversal-via-bazarlisteaction-template-parameter](https://www.vulncheck.com/advisories/yeswiki-before-4.7.0-template-traversal-via-bazarlisteaction-template-parameter)

## Related threats

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- [YesWiki server-side request forgery in Bazar CSV import](https://junglewise.ai/threats/cve-2026-116827-yeswiki-before-4-7-0-contains-a-server-side-request-forgery)
- [YesWiki server-side request forgery in DuplicationManager](https://junglewise.ai/threats/cve-2026-116826-yeswiki-before-4-7-0-contains-a-server-side-request-forgery)
- [YesWiki HTTP Signature replay protection missing in ActivityPub inbox](https://junglewise.ai/threats/cve-2026-116825-yeswiki-from-4-6-2-before-4-7-0-lacks-replay-protection-in)
- [YesWiki stored cross-site scripting in referrers_sites handler](https://junglewise.ai/threats/cve-2026-116824-yeswiki-before-4-7-0-contains-a-stored-cross-site-scripting)