CVE-2021-33570

Public Exploit

Description

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.

Category

5.4
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 1.26% Top 25%
Third-Party Advisory packetstormsecurity.com Third-Party Advisory packetstormsecurity.com Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory tridentsec.io Third-Party Advisory exploit-db.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://github.com/Paxa/postbird/issues/132 issue tracking third party advisory
https://github.com/Paxa/postbird/issues/133 issue tracking third party advisory
https://github.com/Paxa/postbird/issues/134 issue tracking third party advisory
https://github.com/Tridentsec-io/postbird third party advisory exploit
http://packetstormsecurity.com/files/162831/Postbird-0.8.4-Cross-Site-Scripting-Local-File-Inclusion.html exploit vdb entry third party advisory
http://packetstormsecurity.com/files/162872/Postbird-0.8.4-XSS-LFI-Insecure-Data-Storage.html vdb entry third party advisory
https://www.exploit-db.com/exploits/49910 exploit vdb entry third party advisory
https://tridentsec.io/blogs/postbird-cve-2021-33570/ url repurposed third party advisory broken link

Frequently Asked Questions

What is the severity of CVE-2021-33570?
CVE-2021-33570 has been scored as a medium severity vulnerability.
How to fix CVE-2021-33570?
To fix CVE-2021-33570, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-33570 being actively exploited in the wild?
It is possible that CVE-2021-33570 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.