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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.

在 Ubuntu 中，随 accountsservice（版本低于 23.13.9-8ubuntu7）一起发布的特定于 Ubuntu 的语言辅助脚本（save-to-pam-env、update-langlist）将 ~/.pam_environment 文件中由用户控制的 LANGUAGE 条目视为可信输入。该值未加转义地被插入到 GNU sed 的替换表达式中，攻击者可通过注入 sed 的 'e' 标志以及任意 shell 命令，从而以 AccountsService 辅助进程的权限（真实用户 ID 为 0）执

CVSS 7.8 · High EPSS 0.13% · P3

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

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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