[NEW] [medium] MailPit: Vulnerability allows bypassing of security measures

mediumCVE-2026-55187

A remote, anonymous attacker can exploit a vulnerability in MailPit to bypass security measures.

CSIRTS triage

vendor: MailPit product: MailPit Authentication bypass

What: A vulnerability in MailPit allows a remote, anonymous attacker to bypass security measures.
Who is affected: Users of MailPit are affected by this vulnerability.
Urgency: Remediation is medium urgency as the vulnerability is not currently exploited but poses a security risk.
Action: Update MailPit to the latest version to mitigate this issue.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-07-13
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2283

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-551870.28% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 20% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-55187	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

mediumCVE-2026-55187: Mailpit is an email testing tool and API for developers. Prior to 1.30.2, the remediation ship…nvd

Recent advisories for MailPit

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

medium[NEW] [medium] MailPit: Vulnerability allows disclosure of informationcert-bund · 2026-07-29
medium[UPDATE] [medium] MailPit: Vulnerability allows Denial of Servicecert-bund · 2026-07-21
medium[UPDATE] [medium] MailPit: Multiple vulnerabilitiescert-bund · 2026-07-21
mediumCVE-2026-48824: Mailpit is an email testing tool and API for developers. Prior to version 1.30.1, the fix for …nvd · 2026-07-20
highCVE-2026-45713: Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the Mailpit …nvd · 2026-07-20
mediumCVE-2026-45712: Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the screensh…nvd · 2026-07-20