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Vulnerabilities

Vulnerability · CVE-2026-91830

Subscribe to Comments < 2.3.3 - Unauthenticated Subscription Management Key Disclosure via Forged Comment Cookie

Published Oct 16, 2026 · catalog updated Oct 16, 2026 · Unknown Subscribe to Comments

Check if you run it

No confirmed exploitation is on record for CVE-2026-91830. EPSS is 0.18%. Act only if a listed version of Unknown Subscribe to Comments is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.18%
Remediation
Version ranges on file
Affected products
stated Subscribe to Comments · vendor Unknown Subscribe to Comments

The Subscribe to Comments WordPress plugin before 2.3.3 does not sign or validate a cookie it trusts to identify a commenter, allowing unauthenticated attackers to disclose a subscriber's management key and silently alter that subscriber's subscriptions.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • stated Subscribe to Comments< 2.3.3
  • vendor Unknown Subscribe to Commentsversion unspecified

How to fix CVE-2026-91830

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-91830. EPSS is 0.18%. Act only if a listed version of Unknown Subscribe to Comments is installed.

Which versions are affected?

Compare what you have installed with Subscribe to Comments < 2.3.3. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.18%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

WordPress security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 16, 2026 · NIST NVD

    Detected

    The Subscribe to Comments WordPress plugin before 2.3.3 does not sign or validate a cookie it trusts to identify a commenter, allowing unauthenticated attackers to disclose a subscriber's management key and silently alter that subscriber's subscriptions.

  2. Oct 16, 2026 · CVE.org

    Updated

    The Subscribe to Comments WordPress plugin before 2.3.3 does not sign or validate a cookie it trusts to identify a commenter, allowing unauthenticated attackers to disclose a subscriber's management key and silently alter that subscriber's subscriptions.

Sources

  • CVE.orgVulnerability recordCVE-2026-91830

    The Subscribe to Comments WordPress plugin before 2.3.3 does not sign or validate a cookie it trusts to identify a commenter, allowing unauthenticated attackers to disclose a subscriber's management key and silently alter that subscriber's subscriptions.

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-91830

    30-day exploitation probability 0.2%

    first.org
  • NIST NVDVulnerability recordCVE-2026-91830

    The Subscribe to Comments WordPress plugin before 2.3.3 does not sign or validate a cookie it trusts to identify a commenter, allowing unauthenticated attackers to disclose a subscriber's management key and silently alter that subscriber's subscriptions.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.