CVE-2026-27447— OpenPrinting CUPS: Authorization bypass via case-insensitive group-member lookup
Quick assessment
Affected
OpenPrinting cups
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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。
Possible ATT&CK Techniques 1 AI
T1198
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
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
-
CVE-2026-105206
ZITADEL before 4.17.3 Cross-Organization Authentication Meth -
CVE-2026-105131
mayswind ezBookkeeping 1.2.0 before 2.0.1 Privilege Escalati -
CVE-2026-105129
LaraDashboard before 1.4.8 Incorrect Authorization Exposes S -
CVE-2026-71890
MLS external commit can remove an arbitrary group member -
CVE-2026-71886
OpenPGP certification accepted from a subkey without certifi
V. Comments for CVE-2026-27447
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