CVE-2026-42687: WordPress EventPrime plugin <= 4.3.2.1 - PHP Object Injection vulnerability
Deferred
Published 15-06-2026Last modified 16-06-2026
Vulnerability summary
CVE-2026-42687 is a high (CVSS 8.1) Deserialization of Untrusted Data vulnerability in eventprime. EPSS estimates a 0.44% chance of exploitation in the next 30 days, higher than 36.8% of scored vulnerabilities. Fixed in 4.3.2.2.
CVSS score
8.1/10
010
High · v3.1 (CVE.org)EPSS score
0.44%
0%100%
Low · +0.12 pp in 30 daysKEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded
Timeline
- 15-06-2026PublishedVulnerability first disclosed.
- 16-06-2026Last modifiedVulnerability information updated.
Description
Unauthenticated PHP Object Injection in EventPrime <= 4.3.2.1 versions.
CVSS metrics
3 scores · 3 sources · 1 versionHigh 8.1Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesAll 3 agree
- NVDNIST8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- wordfenceSource8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.44%
Chance of exploitation in the next 30 days
Percentile
37%
Versus all other CVEs
30-day change
Increase +0.12 pp
From 0.32% on 22-09-2026
22-09-202622-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Eventprime1 product
- eventprime≥ n/a, ≤ 4.3.2.1
Wordpress1 product
- eventprime-event-calendar-management≤ 4.3.2.1 (fixed in 4.3.2.2)
2 vendors · 2 products
References
2 links- patchstack.com/database/…VDB Entry