# CVE-2026-26291: GROWI Stored Cross-Site Scripting

Source: https://junglewise.ai/threats/cve-2026-26291-growi-stored-cross-site-scripting  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-15. Updated: 2026-05-19  
License: CC BY 4.0 with a link back

CVE-2026-26291 · Severity: medium · CVSS 5.4 · Published 2026-04-15

GROWI, a collaborative wiki and knowledge-sharing platform, contains a security flaw that allows an attacker to inject malicious scripts into shared pages. If a user views a compromised page, the script can execute in their browser, potentially leading to unauthorized actions or the theft of sensitive session information. This risk is particularly relevant for internal documentation sites where multiple users contribute content.

## Quick answers

**Is CVE-2026-26291 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-26291 being exploited in the wild.

**How severe is CVE-2026-26291?** Medium severity, with a CVSS score of 5.4, published 15 April 2026.

**Which products and versions are affected?** GROWI, Inc. GROWI v7.4.6 and earlier.

**Is there a fix for CVE-2026-26291?** A patch was published on 2026-04-15: GROWI v7.4.7 released to address the issue Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-26291 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-26291?** Check whether anything you run is named in the advisory. 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.

## Technical details

A stored cross-site scripting (XSS) vulnerability exists in GROWI versions up to and including v7.4.6. The flaw is rooted in improper neutralization of user-supplied input (CWE-79) during web page generation. An authenticated attacker with low privileges can inject malicious scripts into persistent data stores (such as wiki pages). When other users, including administrators, view the affected content, the script executes within the context of their session. This can lead to session hijacking, unauthorized data modification, or redirection to malicious sites. The vulnerability is addressed in GROWI v7.4.7.

## Affected products

- GROWI, Inc. GROWI v7.4.6 and earlier

## Timeline

- 2026-04-15: disclosed: Vulnerability reported via JVN/JPCERT/CC
- 2026-04-15: advisory
- 2026-04-15: patched: GROWI v7.4.7 released to address the issue

## References

- [https://growi.co.jp/news/43/](https://growi.co.jp/news/43/)
- [https://jvn.jp/en/jp/JVN62079296/](https://jvn.jp/en/jp/JVN62079296/)