Local data theft via stored event-handler injection
Published May 25, 2021 · Updated Aug 3, 2024
Stored XSS in Postbird 0.8.4 allows remote authenticated users to execute JavaScript when a user views a crafted PostgreSQL table value. Postbird renders an IMG element stored in a database table without neutralizing its onerror handler, causing the embedded script to execute. The attacker needs database write access and user interaction; the script can read local files through file URLs or extract saved PostgreSQL connections from localStorage.
Summary
What happened
Stored XSS in Postbird 0.8.4 allows remote authenticated users to execute JavaScript when a user views a crafted PostgreSQL table value. Postbird renders an IMG element stored in a database table without neutralizing its onerror handler, causing the embedded script to execute. The attacker needs database write access and user interaction; the script can read local files through file URLs or extract saved PostgreSQL connections from localStorage.
The record
- CVE
- CVE-2021-33570
- Published
- May 25, 2021
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-79, T1203
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 25, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Postbird 0.8.4 - Javascript Injectionfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo