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CVE-2026-49939— Apache James: Negative IMAP ACL administer authorization bypass through JMAP protocol

Quick assessment

Affected
Apache Software Foundation Apache James
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 Apache James 服务器 3.9.1 之前的版本中，JMAP 协议暴露了访问控制列表（ACL）处理不当的漏洞，该问题未正确处理由 IMAP 协议设置的否定规则（即拒绝规则）。 这导致用户即使已在 IMAP 协议中被明确禁止管理文件夹，仍可通过 JMAP 协议执行文件夹管理操作。 建议用户升级至 3.9.1 版本，该版本已修复此问题。

AI Predicted 6.5 Difficulty: Moderate
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I. Basic Information for CVE-2026-49939

Vulnerability Information
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Vulnerability Title
Apache James: Negative IMAP ACL administer authorization bypass through JMAP protocol
Source: CVE Program / CVE List V5
Vulnerability Description
In Apache James server prior version 3.9.1 improper Access Control List processing is exposed by the JMAP protocol which do not account for negative rules positionned by IMAP protocol. This results in users being able to administer folders in JMAP despite having being explicitly denied the right to do so in IMAP. Users are recommended to upgrade to version 3.9.1 which fixes this issue.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache James 3.9.0 ~ 3.9.1 -

II. Public POCs for CVE-2026-49939

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III. Intelligence Information for CVE-2026-49939

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Other References for CVE-2026-49939 (1)

Same Patch Batch · Apache Software Foundation · 2026-11-06 · 7 CVEs total

CVE-2026-85111 8.7 HIGH Apache James: Denial of service upon MIME parsing
CVE-2025-66621 Apache James: SASL OAUTHBEARER do not validate aud in JWT payload if misconfigred
CVE-2026-76171 Apache James: SSRF filter bypass in the JMAP PushSubscription web-push client
CVE-2026-74756 Apache James: WebAdmin exposed without authentication on official Docker default
CVE-2026-76168 Apache James: ManageSieve file implementation cross-user path traversal
CVE-2026-85108 Apache James MIME4J: Denial of service due to Allocation of Resources Without Limits or Th

IV. Related Vulnerabilities

Same product: Apache James
Same vendor: Apache Software Foundation
Same weakness: CWE-284