CVE-2021-33570

Postbird 0.8.4 allows stored XSS via the onerror attribute of an IMG element in any PostgreSQL database table. This can result in reading local files via vectors involving XMLHttpRequest and open of a file:/// URL, or discovering PostgreSQL passwords via vectors involving Window.localStorage and savedConnections.

• CWE-79

• http://packetstormsecurity.com/files/162831/Postbird-0.8.4-Cross-Site-Scripting-Local-File-Inclusion.htmlExploit, Third Party Advisory, VDB Entry
• http://packetstormsecurity.com/files/162872/Postbird-0.8.4-XSS-LFI-Insecure-Data-Storage.htmlThird Party Advisory, VDB Entry
• https://github.com/Paxa/postbird/issues/132Issue Tracking, Third Party Advisory
• https://github.com/Paxa/postbird/issues/133Issue Tracking, Third Party Advisory
• https://github.com/Paxa/postbird/issues/134Issue Tracking, Third Party Advisory
• https://github.com/Tridentsec-io/postbirdExploit, Third Party Advisory
• https://tridentsec.io/blogs/postbird-cve-2021-33570/Broken Link, Third Party Advisory, URL Repurposed
• https://www.exploit-db.com/exploits/49910Exploit, Third Party Advisory, VDB Entry
• http://packetstormsecurity.com/files/162831/Postbird-0.8.4-Cross-Site-Scripting-Local-File-Inclusion.htmlExploit, Third Party Advisory, VDB Entry
• http://packetstormsecurity.com/files/162872/Postbird-0.8.4-XSS-LFI-Insecure-Data-Storage.htmlThird Party Advisory, VDB Entry
• https://github.com/Paxa/postbird/issues/132Issue Tracking, Third Party Advisory
• https://github.com/Paxa/postbird/issues/133Issue Tracking, Third Party Advisory
• https://github.com/Paxa/postbird/issues/134Issue Tracking, Third Party Advisory
• https://github.com/Tridentsec-io/postbirdExploit, Third Party Advisory
• https://tridentsec.io/blogs/postbird-cve-2021-33570/Broken Link, Third Party Advisory, URL Repurposed
• https://www.exploit-db.com/exploits/49910Exploit, Third Party Advisory, VDB Entry

Published

May 25, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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