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CVE-2021-33570

MediumPublished

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...

Published: May 25, 2021
Updated: Aug 3, 2024
Assigning CNA: mitre
Evidence observed: May 27, 2021

Primary CVSS

5.4/ 10Medium

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS probability estimate

3.6%

Low · next 30 days

Percentile: 88.8%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

Postbird 0.8.4 - Javascript InjectionExploit
Debshubra Chakraborty · multiple · May 27, 2021

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