CVE-2025-53532: giscus allows unauthorized discussion creation

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-07-07 · updated 2026-06-17
Weakness: CWE-285

Description

giscus is a commenting system powered by GitHub Discussions. A bug in giscus' discussions creation API allowed an unauthorized user to create discussions on any repository where giscus is installed. This affects the server-side part of giscus, which is provided via http://giscus.app or your own self-hosted service. This vulnerability is fixed by the c43af7806e65adfcf4d0feeebef76dc36c95cb9a and 4b9745fe1a326ce08d69f8a388331bc993d19389 commits.

Affected products

giscus: before c43af7806e65adfcf4d0feeebef76dc36c95cb9a

References

https://github.com/giscus/giscus/commit/4b9745fe1a326ce08d69f8a388331bc993d19389
https://github.com/giscus/giscus/commit/c43af7806e65adfcf4d0feeebef76dc36c95cb9a
https://github.com/giscus/giscus/security/advisories/GHSA-w6vg-v24f-4vm3

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