Platform
javascript
Component
pi-mono
Fixed in
0.58.5
CVE-2026-5533 describes a cross-site scripting (XSS) vulnerability discovered in pi-mono version 0.58.4. This flaw allows attackers to inject malicious scripts into the web UI, potentially leading to session hijacking or defacement. The vulnerability affects versions 0.58.4–0.58.4 and has been publicly disclosed, with a proof-of-concept available. The vendor has not yet provided a response or patch.
Successful exploitation of CVE-2026-5533 allows an attacker to execute arbitrary JavaScript code within the context of a user's browser session. This can lead to a variety of malicious actions, including stealing session cookies, redirecting users to phishing sites, or injecting malicious content into the web UI. The vulnerability resides within the SVG Artifact Handler, suggesting that attackers could craft malicious SVG files or manipulate existing ones to trigger the XSS payload. Given the public availability of a proof-of-concept, the risk of exploitation is elevated, particularly if the pi-mono web UI is publicly accessible.
CVE-2026-5533 has been publicly disclosed and a proof-of-concept is available, indicating a high probability of exploitation. The vulnerability is not currently listed on CISA KEV. The public disclosure date (2026-04-05) suggests that attackers may already be actively scanning for vulnerable instances. The lack of a response from the vendor increases the urgency of implementing mitigation measures.
Exploit Status
EPSS
0.03% (10% percentile)
CISA SSVC
CVSS Vector
As the vendor has not yet released a patch, immediate mitigation strategies are crucial. Consider implementing strict input validation and output encoding on all user-supplied data within the web UI to prevent the injection of malicious scripts. Web application firewalls (WAFs) can be configured to detect and block XSS attempts targeting the SVG Artifact Handler. Regularly scan the pi-mono installation for unauthorized modifications or suspicious files. Until a patch is available, restrict access to the pi-mono web UI to trusted users only. After a patch is released, upgrade to the fixed version and confirm by verifying that SVG artifacts render correctly without unexpected script execution.
Update to a patched version of the pi-mono library. Consult the project repository or package sources for information on available versions and upgrade instructions. The vendor's lack of response suggests caution and verification of the solution in a test environment before production deployment.
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CVE-2026-5533 is a cross-site scripting (XSS) vulnerability affecting pi-mono version 0.58.4, allowing attackers to inject malicious scripts into the web UI.
You are affected if you are using pi-mono version 0.58.4 and have not yet implemented mitigation measures or upgraded to a patched version.
Upgrade to a patched version of pi-mono as soon as it becomes available. Until then, implement input validation, output encoding, and WAF rules to mitigate the risk.
A proof-of-concept is publicly available, indicating a high probability of exploitation, and the vulnerability has been publicly disclosed.
As of the disclosure date, there is no official advisory from the vendor. Monitor the pi-mono project's website and GitHub repository for updates.
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