CVE-2026-27447

MEDIUMNVD 4.84.8—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.8 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 96% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
4.8
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.8Exploit: NoneExposed: 0

A fix is available — apply it.

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, CUPS daemon (cupsd) contains an authorization bypass vulnerability due to case-insensitive username comparison during authorization checks. The vulnerability allows an unprivileged user to gain unauthorized access to restricted operations by using a user with a username that differs only in case from an authorized user. At time of publication, there are no publicly available patches.

CVSS v3
4.8
EG Score
4.8(medium)
EPSS
23.7%
KEV
Not listed

Published

April 3, 2026

Last Modified

April 22, 2026

References (2)

Vendor Advisories for CVE-2026-27447(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibcupsimage2t64 (2.4.16-1ubuntu1.2) @ resolute2026-06-11ubuntu
redhatcups-main-2.4.17-1.hum12026-04-17redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 10× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 110 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 02:00 UTCEPSS rescore
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  1. 2026-06-28 14:07 UTCEPSS rescore
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  11. 2026-06-22 14:25 UTCEPSS rescore
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  22. 2026-06-16 17:52 UTCEPSS rescore
  23. 2026-06-15 17:48 UTCEPSS rescore
  24. 2026-06-14 23:18 UTCEPSS rescore
  25. 2026-06-13 23:00 UTCEPSS rescore
  26. 2026-06-12 23:12 UTCEPSS rescore
  27. 2026-06-12 23:12 UTCEPSS rescore
  28. 2026-06-11 21:54 UTCEG score recompute
  29. 2026-06-11 21:54 UTCVendor advisory
  30. 2026-06-11 14:00 UTCEPSS rescore
  31. 2026-06-10 22:18 UTCEPSS rescore
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  33. 2026-06-10 13:35 UTCEG score recompute
  34. 2026-06-10 13:35 UTCVendor advisory
  35. 2026-06-10 13:22 UTCEPSS rescore
  36. 2026-06-09 14:26 UTCEG score recompute
  37. 2026-06-09 14:26 UTCVendor advisory
  38. 2026-06-08 14:17 UTCEPSS rescore
  39. 2026-06-08 14:17 UTCEPSS rescore
  40. 2026-06-08 09:45 UTCEG score recompute
  41. 2026-06-08 09:45 UTCVendor advisory
  42. 2026-06-07 15:25 UTCEPSS rescore
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  44. 2026-06-07 15:25 UTCEPSS rescore
  45. 2026-06-07 10:49 UTCEG score recompute
  46. 2026-06-07 10:49 UTCVendor advisory
  47. 2026-06-06 13:47 UTCEPSS rescore
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  49. 2026-06-05 22:47 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2026-27447?
CVE-2026-27447 is a medium vulnerability published on April 3, 2026. OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, CUPS daemon (cupsd) contains an authorization bypass vulnerability due to case-insensitive username comparison during authorization checks. The vulnerability allows an…
When was CVE-2026-27447 disclosed?
CVE-2026-27447 was first published in the National Vulnerability Database on April 3, 2026, with the most recent update on April 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-27447 actively exploited?
CVE-2026-27447 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 23.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-27447?
CVE-2026-27447 has a CVSS v3 base score of 4.8 (NVD).
How do I remediate CVE-2026-27447?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-27447, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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