CVE-2025-53532Network attack vector

Unauthorized discussion creation via missing token validation

Published Jul 7, 2025 · Updated Jul 7, 2025

Improper authorization in giscus before commit c43af78 allows remote attackers to create discussions in repositories using the service. The POST handler in pages/api/discussions either omits bearer-token validation or fails to await its asynchronous token check before creating a discussion. No authentication or user interaction is required, and the bounded consequence is unauthorized discussion creation rather than a bypass of GitHub content moderation.

CVSS severity5.3
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in giscus before commit c43af78 allows remote attackers to create discussions in repositories using the service. The POST handler in pages/api/discussions either omits bearer-token validation or fails to await its asynchronous token check before creating a discussion. No authentication or user interaction is required, and the bounded consequence is unauthorized discussion creation rather than a bypass of GitHub content moderation.

The record

CVE
CVE-2025-53532
Published
Jul 7, 2025
Updated
Jul 7, 2025
Vendor
giscus
Product
giscus
Classifications
CWE-285, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 7, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< c43af7806e65adfcf4d0feeebef76dc36c95cb9a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

giscus · giscusversion=< c43af7806e65adfcf4d0feeebef76dc36c95cb9a

Published CVSS scores

5.3GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-285Improper Authorization
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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