CVE-2026-5078

mediumCVSS 5.3covered by 1 sourcefirst seen 2026-07-10

Impact Morgan's :remote-user token extracts the Basic auth username from the Authorization header and writes it to the log stream without neutralizing control characters. An attacker can send a crafted Authorization: Basic header containing CR/LF characters to inject forged log lines, corrupting the one-request-per-line structure of access logs. The built-in combined, common, default, and short formats are affected, as well as any custom format that includes :remote-user. Patches Users should upgrade to version 1.11.0. Workarounds Use a custom format string that does not include :remote-user.

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Exploitation outlook

Low exploitation risk0.25% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 16% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumGHSA-4vj7-5mj6-jm8m: morgan vulnerable to Log Forging via unneutralized control characters in :remote-userghsa · 2026-07-10

External references

NVD record for CVE-2026-5078

CVE.org record

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