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TI-2023-03463 Aliases CVE-2023-3707GHSA-2cc2-mcjj-r4mp

ActivityPub for WordPress < 1.0.0 - Subscriber+ Arbitrary Post Content Disclosure

Priority MEDIUM 53Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

The ActivityPub WordPress plugin before 1.0.0 does not ensure that post contents to be displayed are public and belong to the plugin, allowing any authenticated user, such as subscriber to retrieve the content of arbitrary post (such as draft and private) via an IDOR vector. Password protected posts are not affected by this issue.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0057 47th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix Fixed ActivityPub (Unknown): 1.0.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
UnknownActivityPubbefore 1.0.01.0.0Patch availableCNA
  • ActivityPub VendorUnknown Affected before 1.0.0 Fixed in 1.0.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:automattic:activitypub:*:*:*:*:*:wordpress:*:*before 1.0.0VulnerableAutomattic
  • cpe:2.3:a:automattic:activitypub:*:*:*:*:*:wordpress:*:* Versions before 1.0.0 Vulnerable ·Automattic

Remediation

  • Fix · CNA ActivityPub (Unknown) Fixed in 1.0.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    ActivityPub 1.0.0

    4 records Highest priority Priority MEDIUM 3 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2023-03499 ActivityPub for WordPress < 1.0.1 - Contributor+ Stored XSSPriority MEDIUM 58
    • TI-2023-03462 ActivityPub for WordPress < 1.0.0 - Subscriber+ Arbitrary Post Title DisclosurePriority MEDIUM 53
    • TI-2023-04657 ActivityPub for WordPress < 1.0.0 - Contributor+ Stored XSSPriority LOW 25
    Show all 4 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-3707
  2. 2026-10-03 Alias added: GHSA-2cc2-mcjj-r4mp

References

Exploit 1

  • TI-2026-03776 ActivityPub Routing < 8.0.2 - Unauthenticated Drafts/Scheduled/Pending Posts Disclosure CVSS 3.1HIGH 7.5
  • TI-2023-03499 ActivityPub for WordPress < 1.0.1 - Contributor+ Stored XSS CVSS 3.1MEDIUM 5.4
  • TI-2023-03462 ActivityPub for WordPress < 1.0.0 - Subscriber+ Arbitrary Post Title Disclosure CVSS 3.1MEDIUM 4.3
  • TI-2023-04657 ActivityPub for WordPress < 1.0.0 - Contributor+ Stored XSS CVSS 3.1MEDIUM 5.4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences