ActivityPub for WordPress < 1.0.0 - Contributor+ Stored XSS
Priority LOW 25Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
The ActivityPub WordPress plugin before 1.0.0 does not escape user metadata before outputting them in mentions, which could allow users with a role of Contributor and above to perform Stored XSS attacks
Why it matters now
EPSS 0.0049 42nd 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
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Unknown | ActivityPub | before 1.0.0 | 1.0.0 | Patch available | CNA |
- ActivityPub VendorUnknown Affected before 1.0.0 Fixed in 1.0.0 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:automattic:activitypub:*:*:*:*:*:wordpress:*:* | before 1.0.0 | Vulnerable | Automattic |
- 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-2023-03463 ActivityPub for WordPress < 1.0.0 - Subscriber+ Arbitrary Post Content DisclosurePriority MEDIUM 53
- TI-2023-03462 ActivityPub for WordPress < 1.0.0 - Subscriber+ Arbitrary Post Title DisclosurePriority MEDIUM 53
Timeline
- 2026-10-02 Threatist record created from CVE-2023-5057
- 2026-10-03 Alias added: GHSA-rcgg-pr6j-3pmh
References
More Automattic Activitypub vulnerabilities
- 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-2023-03463 ActivityPub for WordPress < 1.0.0 - Subscriber+ Arbitrary Post Content Disclosure CVSS 3.1MEDIUM 4.3
- TI-2023-03462 ActivityPub for WordPress < 1.0.0 - Subscriber+ Arbitrary Post Title Disclosure CVSS 3.1MEDIUM 4.3
Sources
- CVE-2023-5057 · CVE Program
- CVE-2023-5057 · NVD
- FIRST EPSS
- GHSA-rcgg-pr6j-3pmh · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences