CVE-2025-46553
@misskey-dev/summaly Redirect Filter Bypass
@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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Passive
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
@misskey-dev/summaly Redirect Filter Bypass
@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.
- Record
CVE-2025-46553- CVSS 4.0
- 2.1 Low
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 - Weakness
- CWE-693, CWE-601, CWE-665, CWE-669
- Updated
- 2026-11-02
EUVDEUVD-2025-13413
@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.
- Record
EUVD-2025-13413- CVSS 4.0
- 2.1 Low
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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-7899-w6c4-vqc4
@misskey-dev/summaly Redirect Filter Bypass
Summary
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.
Details
In the main summaly function, a new scrapingOptions object is created and passed to either the matched plugin, if any, or the default summarize function. The issue here is that the new scrapingOptions object is not provided the allowRedirects property of opts.
PoC
- Publish a post containing a link to any URL that redirects on Misskey.
- A preview will be generated for the target of the redirect, despite Misskey passing
allowRedirects: false.
Impact
Misskey will follow redirects, despite explicitly requesting not to.
- Record
GHSA-7899-w6c4-vqc4- CVSS 4.0
- 2.1 Low
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 - Weakness
- CWE-601, CWE-665, CWE-669, CWE-693
- Updated
- 2026-11-02
NVD
@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.
- Record
CVE-2025-46553- CVSS 4.0
- 2.1 Low
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-601, CWE-665, CWE-669, CWE-693
- Updated
- 2026-11-02
OSV
@misskey-dev/summaly Redirect Filter Bypass
@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.
- Record
CVE-2025-46553- CVSS 4.0
- 2.1 Low
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 - Weakness
- CWE-601, CWE-665, CWE-669, CWE-693
- Updated
- 2026-11-02
OSVGHSA-7899-w6c4-vqc4
@misskey-dev/summaly Redirect Filter Bypass
Summary
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.
Details
In the main summaly function, a new scrapingOptions object is created and passed to either the matched plugin, if any, or the default summarize function. The issue here is that the new scrapingOptions object is not provided the allowRedirects property of opts.
PoC
- Publish a post containing a link to any URL that redirects on Misskey.
- A preview will be generated for the target of the redirect, despite Misskey passing
allowRedirects: false.
Impact
Misskey will follow redirects, despite explicitly requesting not to.
- Record
GHSA-7899-w6c4-vqc4- CVSS 4.0
- 2.1 Low
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 - Weakness
- CWE-601, CWE-665, CWE-669, CWE-693
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
@misskey-dev/summalynpm |
3.0.1 up to 5.2.1 | 5.2.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-46553 is a low vulnerability (CVSS 2.1) in Misskey Summaly, published May 5, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.26%, the 18th percentile. Fixed in @misskey-dev/summaly 5.2.1.
References
github.com/misskey-dev/summaly/security/advisories/GHSA-7899-w6c4-vqc4
nvd.nist.gov/vuln/detail/CVE-2025-46553