CVE-2026-27447— OpenPrinting CUPS: Authorization bypass via case-insensitive group-member lookup
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I. Basic Information for CVE-2026-27447
Vulnerability Information
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Vulnerability Title
OpenPrinting CUPS: Authorization bypass via case-insensitive group-member lookup
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制不正确
Source: NVD (National Vulnerability Database)
Vulnerability Title
OpenPrinting CUPS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenPrinting CUPS是OpenPrinting公司的一个适用于 Linux® 和其他类 Unix® 操作系统的基于标准的开源打印系统。 OpenPrinting CUPS 2.4.16及之前版本存在安全漏洞，该漏洞源于授权检查时用户名比较不区分大小写，可能导致授权绕过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| OpenPrinting | cups | <= 2.4.16 | - |
II. Public POCs for CVE-2026-27447
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · OpenPrinting · 2026-04-03 · 5 CVEs total
| CVE-2026-34978 | 6.5 MEDIUM | OpenPrinting CUPS: Path traversal in RSS notify-recipient-uri enables file write outside C |
| CVE-2026-34979 | 5.3 MEDIUM | OpenPrinting CUPS: Heap overflow in `get_options()` |
| CVE-2026-34980 | OpenPrinting CUPS: Shared PostScript queue lets anonymous Print-Job requests reach `lp` co | |
| CVE-2026-34990 | OpenPrinting CUPS: Local print admin token disclosure using temporary printers |
IV. Related Vulnerabilities
Same product: cups
- CVE-2026-41079
OpenPrinting CUPS: Heap out-of-bounds read in SNMP supply-le - CVE-2026-39316
CUPS has a use-after-free in `cupsdDeleteTemporaryPrinters` - CVE-2026-39314
CUPS has an integer underflow in `_ppdCreateFromIPP` causes - CVE-2026-34980
OpenPrinting CUPS: Shared PostScript queue lets anonymous Pr - CVE-2026-34979
OpenPrinting CUPS: Heap overflow in `get_options()`
Same vendor: OpenPrinting
- CVE-2026-41079
OpenPrinting CUPS: Heap out-of-bounds read in SNMP supply-le - CVE-2026-39316
CUPS has a use-after-free in `cupsdDeleteTemporaryPrinters` - CVE-2026-39314
CUPS has an integer underflow in `_ppdCreateFromIPP` causes - CVE-2026-34980
OpenPrinting CUPS: Shared PostScript queue lets anonymous Pr - CVE-2026-34979
OpenPrinting CUPS: Heap overflow in `get_options()`
Same weakness: CWE-863
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HCL BigFix WebUI is affected by an improper authorization vu - CVE-2026-42296
Argo Workflows has incomplete fix for CVE-2026-31892: hostNe - CVE-2025-66170
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FreeScout IDOR Vulnerability: PERM_EDIT_USERS allows modifyi
V. Comments for CVE-2026-27447
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