CVE-2025-46553: @misskey-dev/summaly Redirect Filter Bypass

2.1 CVSS

Description

@misskey-dev/summaly is a tool for getting a summary of a web page. Starting in version 3.0.1 and prior to version 5.2.1, a logic error in the main `summaly` function causes the `allowRedirects` option to never be passed to any plugins, and as a result, isn't enforced. Misskey will follow redirects, despite explicitly requesting not to. Version 5.2.1 contains a patch for the issue.

Classification

CVE ID: CVE-2025-46553

CVSS Base Severity: LOW

CVSS Base Score: 2.1

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N/E:P

Problem Types

CWE-693: Protection Mechanism Failure CWE-601: URL Redirection to Untrusted Site ('Open Redirect') CWE-665: Improper Initialization CWE-669: Incorrect Resource Transfer Between Spheres

Affected Products

Vendor: misskey-dev

Product: summaly

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.1% (probability of being exploited)

EPSS Percentile: 28.11% (scored less or equal to compared to others)

EPSS Date: 2025-06-03 (when was this score calculated)

Stakeholder-Specific Vulnerability Categorization (SSVC)

SSVC Exploitation: poc

SSVC Technical Impact: partial

SSVC Automatable: true

References

https://nvd.nist.gov/vuln/detail/CVE-2025-46553
https://github.com/misskey-dev/summaly/security/advisories/GHSA-7899-w6c4-vqc4
https://github.com/misskey-dev/summaly/commit/45153b4f08a772c395a13f7a25399dd87ed022ed

Timeline