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CVE-2026-61898— accountsservice: shell injection via attacker-controlled ~/.pam_environment in Ubuntu language helper scripts

Quick assessment

Affected
Canonical accountsservice
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.

Canonical AccountsService是英国Canonical公司开源的一个提供用户账户信息查询与操作的系统服务。 Canonical AccountsService 23.13.9-8ubuntu7之前版本存在命令注入漏洞，该漏洞源于Ubuntu特定语言辅助脚本将用户控制的LANGUAGE条目视为可信输入，未转义插入GNU sed替换表达式，可能导致攻击者注入sed 'e'标志和任意shell命令，以AccountsService辅助进程权限（真实UID 0）通过SetLanguage D-

CVSS 7.8 · High EPSS 0.19% · P8

Affected Version Matrix 4

VendorProduct Version RangeStatus
Canonical accountsservice 22.07.5-2ubuntu1< 22.07.5-2ubuntu1.6 affected
23.13.9-2ubuntu6< 23.13.9-2ubuntu6.1 affected
23.13.9-8ubuntu5< 23.13.9-8ubuntu5.2 affected
23.13.9-8ubuntu6< 23.13.9-8ubuntu7 affected
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I. Basic Information for CVE-2026-61898

Vulnerability Information
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Vulnerability Title
accountsservice: shell injection via attacker-controlled ~/.pam_environment in Ubuntu language helper scripts
Source: CVE Program / CVE List V5
Vulnerability Description
The Ubuntu-specific language helper scripts (save-to-pam-env, update-langlist) shipped with accountsservice before 23.13.9-8ubuntu7 treat the user-controlled LANGUAGE entry in ~/.pam_environment as trusted input. The value is interpolated unescaped into a GNU sed replacement expression, allowing an attacker to inject a sed 'e' flag and arbitrary shell commands that execute with the privileges of the AccountsService helper process (real UID 0) via the SetLanguage D-Bus method.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Canonical AccountsService 命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Canonical AccountsService是英国Canonical公司开源的一个提供用户账户信息查询与操作的系统服务。 Canonical AccountsService 23.13.9-8ubuntu7之前版本存在命令注入漏洞，该漏洞源于Ubuntu特定语言辅助脚本将用户控制的LANGUAGE条目视为可信输入，未转义插入GNU sed替换表达式，可能导致攻击者注入sed 'e'标志和任意shell命令，以AccountsService辅助进程权限（真实UID 0）通过SetLanguage D-
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
Canonical accountsservice 22.07.5-2ubuntu1 ~ 22.07.5-2ubuntu1.6 -

II. Public POCs for CVE-2026-61898

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III. Intelligence Information for CVE-2026-61898

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Vendor Advisories for CVE-2026-61898 (2)

Same Patch Batch · Canonical · 2026-08-20 · 3 CVEs total

CVE-2026-61897 7.8 HIGH accountsservice: incomplete privilege drop when running Ubuntu-specific language helper sc
CVE-2026-77113 6.7 MEDIUM Path Traversal Vulnerability in apport-unpack

IV. Related Vulnerabilities

Same product: accountsservice
Same vendor: Canonical
Same weakness: CWE-78

V. Comments for CVE-2026-61898

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