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CVE-2026-81643— Broken access control in AshGraphql subscription batcher applies authorization suppression to only the first notification

Quick assessment

Affected
ash-project ash_graphql
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.

ash_graphql 中的授权不当漏洞 ash_graphql 会向订阅者投递那些他们无权查看的记录的 GraphQL 订阅消息。 在 AshGraphql.Subscription.Batcher 中，do_send/5 解析批处理中的第一条通知，并通过 should_send?/1 对其进行过滤，该过滤器会丢弃错误代码为 forbidden（禁止访问）或 not_found（未找到），或未携带错误代码的结果，从而确保不向订阅者暴露未经授权的结果。然而，同一批次中剩余的通知是从进程字典中读取的，重新经过处理管道

CVSS 2.3 · Low
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I. Basic Information for CVE-2026-81643

Vulnerability Information
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Vulnerability Title
Broken access control in AshGraphql subscription batcher applies authorization suppression to only the first notification
Source: CVE Program / CVE List V5
Vulnerability Description
Incorrect Authorization vulnerability in ash-project ash_graphql delivers GraphQL subscription payloads for records a subscriber is not authorized to see. In AshGraphql.Subscription.Batcher, do_send/5 resolves the first notification of a batch and filters it with should_send?/1, which drops results whose errors are coded forbidden or not_found or carry no code, precisely so that unauthorized results are not disclosed. The remaining notifications in the batch are read from the process dictionary, re-run through the pipeline, and appended to the outgoing results without that filter. They reach pubsub.publish_subscription/2, and the not is_nil(record) guard drops only nil records, not error-carrying results. Any two qualifying notifications arriving within the default one-second batch interval suffice, and batching is the default path. The fix applies should_send?/1 to the whole batch. This issue affects ash_graphql: from 1.4.0 before 1.11.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ash-project ash_graphql 1.4.0 ~ 1.11.0 cpe:2.3:a:ash-project:ash_graphql:*:*:*:*:*:*:*:*
ash-project ash_graphql 3cb2c9870d050c7c4bba6c211aaed97d732f7e81 ~ e8e67f39add2ce0771e6db5f086afe68ba212c57 cpe:2.3:a:ash-project:ash_graphql:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-81643

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III. Intelligence Information for CVE-2026-81643

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Other References for CVE-2026-81643 (4)

Same Patch Batch · ash-project · 2026-08-30 · 20 CVEs total

CVE-2026-81636 8.7 HIGH Query-complexity limit bypass via first/last pagination arguments in AshGraphql enables de
CVE-2026-78699 7.2 HIGH rename_tenant returns :ok on a failed rename, enabling cross-tenant access in AshPostgres
CVE-2026-80223 7.1 HIGH Cross-tenant subscription disclosure in AshGraphql authorizes notifications in memory with
CVE-2026-78693 6.9 MEDIUM Incomplete redaction re-attaches the original error path in AshGraphql, leaking internal f
CVE-2026-81633 6.9 MEDIUM Unhandled KeyError in AshGraphql relay node resolution crashes queries via an unknown type
CVE-2026-77454 5.9 MEDIUM exists/2 predicate silently dropped on limited relationships with a parent() filter in Ash
CVE-2026-81319 5.9 MEDIUM Unsafe deserialization of decrypted terms enables node DoS in AshCloak
CVE-2026-75847 5.9 MEDIUM Sensitive attribute values stored in a non-sensitive public changes map in AshPaperTrail
CVE-2026-78228 5.9 MEDIUM Unbounded handle_error recursion enables denial of service in AshOban triggers
CVE-2026-78038 5.9 MEDIUM Job argument injection via :args overrides primary_key and tenant in AshOban
CVE-2026-77970 5.9 MEDIUM Sensitive fields nested in embedded values are not redacted in AshPaperTrail versions
CVE-2026-82367 2.3 LOW Re-entrant synchronous publish in AshGraphql subscription batcher delivers one subscriber'
CVE-2026-80227 2.1 LOW SQL string_trim removes only spaces, diverging from in-memory trimming in AshSql
CVE-2026-81316 2.1 LOW Same-named aggregates with differing filters are conflated in AshSql
CVE-2026-78691 2.1 LOW Unescaped backslash allows LIKE wildcard injection in AshSql string search
CVE-2026-81322 2.1 LOW Cloaked plaintext leaks through a non-sensitive action argument in AshCloak
CVE-2026-81318 2.1 LOW Distinct-query aggregate drops the tenant schema prefix, leaking across tenants in AshSql
CVE-2026-77846 2.1 LOW JSON path injection via unescaped get_path segments in AshSqlite
CVE-2026-77831 2.1 LOW Algorithmic-complexity denial of service in AshPaperTrail full-diff list tracking

IV. Related Vulnerabilities

Same product: ash_graphql
Same vendor: ash-project
Same weakness: CWE-863

V. Comments for CVE-2026-81643

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