Is CVE-2026-30852 actively exploited?

No active exploitation of CVE-2026-30852 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-30852 be exploited remotely?

Yes. CVE-2026-30852 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-30852?

CVE-2026-30852 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2026-30852

CWE-74Published: March 7, 2026· Updated: Mar 11, 2026

7.5

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:13.4th

Official Description

Caddy is an extensible server platform that uses TLS by default. From version 2.7.5 to before version 2.11.2, the vars_regexp matcher in vars.go:337 double-expands user-controlled input through the Caddy replacer. When vars_regexp matches against a placeholder like {http.request.header.X-Input}, the header value gets resolved once (expected), then passed through repl.ReplaceAll() again (the bug). This means an attacker can put {env.DATABASE_URL} or {file./etc/passwd} in a request header and the server will evaluate it, leaking environment variables, file contents, and system info. This issue has been patched in version 2.11.2.

NVD Source

Technical Analysis

CVE-2026-30852 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.5.