CVE-2023-33177 — Xibo is a content management system (CMS)

Xibo is a content management system (CMS). A path traversal vulnerability exists in the Xibo CMS whereby a specially crafted zip file can be uploaded to the CMS via the layout import function by an authenticated user which would allow creation of files outside of the CMS library

01What is this vulnerability?

Xibo is a content management system (CMS). A path traversal vulnerability exists in the Xibo CMS whereby a specially crafted zip file can be uploaded to the CMS via the layout import function by an authenticated user which would allow creation of files outside of the CMS library directory as the webserver user. This can be used to upload a PHP webshell inside the web root directory and achieve…

02Affected products

Vendor	Product	Versions
xibosignage	xibo	cms — >= 1.8.0, < 2.3.17, >= 3.0.0, < 3.3.5

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-05-30T19:12:01.606Z
• Last modified: 2025-06-17T20:21:25.891Z

09References

• github.com — https://github.com/xibosignage/xibo-cms/security/advisories/GHSA-jj27-x85q-crqv
• github.com — https://github.com/xibosignage/xibo-cms/commit/1cbba380fa751a00756e70d7b08b5c664…
• github.com — https://github.com/xibosignage/xibo-cms/commit/45c6b53c3978639db03b63270a56f4397…
• claroty.com — https://claroty.com/team82/disclosure-dashboard
• xibosignage.com — https://xibosignage.com/blog/security-advisory-2023-05/