The MailPress plugin for WordPress is vulnerable to unauthorized access in versions up to, and including, 1.5.0 via the campaign revision-restore REST endpoint (POST /wp-json/mailpress/v1/campaign//restore-revision/). The route in the vulnerable range was registered without a permissionCallback, allowing the restoreRevision() handler to run for unauthenticated requests and overwrite a campaign's content_html with any prior revision. This makes it possible for unauthenticated attackers to modify campaign content by restoring an arbitrary revision.
CVE-2026-18436
MEDIUMPre-NVD 5.35.3—Trending — 4 sources updated this week
EchelonGraph scoreHIGH confidence
Score 5.3 from GitHub Security Advisory published 2026-07-31. a secondary CVSS source baseline 5.3; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 5.3
- EG Score
- 5.3(high)
- EG Risk
- 39(Track)EG Risk 39/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity53% × 45%Exploitation0% × 40%Automatability100% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 14%
- KEV
- Not listed
Published
July 31, 2026
Last Modified
July 31, 2026
References (3)
- security@wordfencehttps://plugins.trac.wordpress.org/browser/mailerpress/trunk/src/Api/CampaignRevisions.php#L155
- security@wordfencehttps://plugins.trac.wordpress.org/browser/mailerpress/trunk/src/Api/CampaignRevisions.php#L156
- security@wordfencehttps://www.wordfence.com/threat-intel/vulnerabilities/id/793a7ef0-8938-47a6-80ed-83f69fbbb27f?source=cve
Vendor Advisories for CVE-2026-18436(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 9× in last 7d / 9× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-08-02 02:26 UTCEPSS rescore
- 2026-08-01 12:46 UTCEG score recompute
- 2026-08-01 12:46 UTCGHSA enrichment
- 2026-08-01 04:15 UTCEPSS rescore
- 2026-07-31 11:26 UTCEG score recompute
- 2026-07-31 11:15 UTCEG score recompute
- 2026-07-31 10:24 UTCEG score recompute
- 2026-07-31 09:29 UTCEG score recompute
- 2026-07-31 09:28 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Same CWE
10 shownCWE-862
- CVE-2013-3960EG 9.9CRITICAL
- CVE-2015-10143EG 9.8CRITICAL
- CVE-2016-11036EG 9.8CRITICAL
- CVE-2018-11541EG 9.8CRITICAL
- CVE-2011-4183NVD 6.5EG 9.8CRITICAL
- CVE-2018-10251EG 9.8EPSS p91CRITICAL
- CVE-2018-1217EG 9.8EPSS p99CRITICAL
- CVE-2018-0015EG 9.8CRITICAL
- CVE-2017-12582EG 9.8CRITICAL
- CVE-2017-1000056EG 9.8CRITICAL
Frequently asked(5)
What is CVE-2026-18436?
CVE-2026-18436 is a medium vulnerability published on July 31, 2026. The MailPress plugin for WordPress is vulnerable to unauthorized access in versions up to, and including, 1.5.0 via the campaign revision-restore REST endpoint (POST /wp-json/mailpress/v1/campaign/<id>/restore-revision/<revisionid>). The route in the vulnerable range was registered without a…
When was CVE-2026-18436 disclosed?
CVE-2026-18436 was first published in the National Vulnerability Database on July 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18436 actively exploited?
CVE-2026-18436 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 86.4% of all scored CVEs.
What is the CVSS score of CVE-2026-18436?
CVE-2026-18436 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-18436?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18436, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-18436
Is Your Infrastructure Affected by CVE-2026-18436?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.