7.5

CVE-2026-4338: automattic activitypub

CVSS: 7.5v3.1HighAnalyzed
Published 08-04-2026Last modified 08-04-2026
Open JSON

Vulnerability summary

CVE-2026-4338 is a high (CVSS 7.5) vulnerability in automattic activitypub. EPSS estimates a 0.44% chance of exploitation in the next 30 days, higher than 36.8% of scored vulnerabilities. 1 public exploit is recorded. Fixed in 8.0.2.

Overall risk
40/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.44%
0%100%
Low · +0.09 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 08-04-2026
    PublishedVulnerability first disclosed.
  2. 08-04-2026
    Last modifiedVulnerability information updated.

Description

The ActivityPub WordPress plugin before 8.0.2 does not properly filter posts to be displayed, allowed unauthenticated users to access drafts/scheduled/pending posts

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.44%

Chance of exploitation in the next 30 days

Percentile

37%

Versus all other CVEs

30-day change

+0.09 pp

From 0.35% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.44%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (wpscan.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Automattic1 product
Unknown1 product
Wordpress1 product
  • activitypub< 8.0.2

3 vendors · 3 products

References

2 links