How severe is CVE-2026-52844?

CVE-2026-52844 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-52844 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-52844?

CVE-2026-52844 affects Caddyserver Caddy. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-52844?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-52844 have an EU (EUVD) identifier?

Yes. CVE-2026-52844 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38557.

When was CVE-2026-52844 published?

CVE-2026-52844 was published on 2026-06-23 and last updated on 2026-06-29.

CVE-2026-52844

CVE-2026-52844 is a high-severity vulnerability in Caddyserver Caddy with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (40th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38557
Weakness: CWE-22
Affected product: Caddyserver Caddy
Published: 2026-06-23
Last modified: 2026-06-29

Description

Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, on Windows, Caddy path matchers treat /private\secret.txt as outside /private/*, but file_server later resolves the same request path as private\secret.txt on disk. An unauthenticated remote client can bypass Caddy path-scoped auth/deny routes protecting /private/*. This vulnerability is fixed in 2.11.4.

Frequently asked questions

What is CVE-2026-52844?: Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, on Windows, Caddy path matchers treat /private\secret.txt as outside /private/*, but file_server later resolves the same request path as private\secret.txt on disk. An unauthenticated remote client can bypass Caddy path-scoped auth/deny routes protecting /private/*. This vulnerability is fixed in 2.11.4.
How severe is CVE-2026-52844?: CVE-2026-52844 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-52844 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-52844?: CVE-2026-52844 affects Caddyserver Caddy. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-52844?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-52844 have an EU (EUVD) identifier?: Yes. CVE-2026-52844 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38557.
When was CVE-2026-52844 published?: CVE-2026-52844 was published on 2026-06-23 and last updated on 2026-06-29.

References

https://github.com/caddyserver/caddy/security/advisories/GHSA-qrp7-cvwr-j2c6

Affected products (1)

cpe:2.3:a:caddyserver:caddy:*:*:*:*:*:*:*:*

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