CVE-2026-54171: Excon: redact additional sensitive/risky headers when following redirects

mediumCVSS 6.5CVE-2026-54171

CSIRTS triage

product: ExconOther

What: Additional sensitive headers are not being redacted when following redirects, which could expose sensitive information.
Who is affected: Users of Excon are affected by this issue.
Urgency: Remediation is necessary due to the medium severity of the vulnerability.
Action: Update Excon to the latest version to ensure sensitive headers are properly redacted.

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

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 6.5
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54171

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-2026-541710.30% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 23% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-54171	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

Recent advisories for Excon

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.

mediumCVE-2026-54171: Excon is usable, fast, simple HTTP 1.1 for Ruby. Prior to 1.5.0, Excon's RedirectFollower midd…nvd · 2026-07-17
mediumGHSA-48rx-c7pg-q66r: Excon does not redact additional sensitive/risky headers when following redirectsghsa · 2026-07-10