CVE-2026-23989Network attack vector

Unauthorized archive access via flawed path-prefix check

Published Feb 6, 2026 · Updated Feb 6, 2026

Incorrect authorization in OpenCloud REVA before 2.40.3 and 2.41.0 through 2.42.2 allows remote attackers to archive out-of-scope files. The gRPC authorization interceptor's checkIfNestedResource function uses strings.HasPrefix on resolved child and parent paths, so a sibling path sharing the parent's text prefix is accepted as a descendant. An anonymous public-link request routed through the archiver service can produce a ZIP or TAR containing resources accessible to the link creator; normal WebDAV requests do not reach the bypass.

CVSS severity8.2
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in OpenCloud REVA before 2.40.3 and 2.41.0 through 2.42.2 allows remote attackers to archive out-of-scope files. The gRPC authorization interceptor's checkIfNestedResource function uses strings.HasPrefix on resolved child and parent paths, so a sibling path sharing the parent's text prefix is accepted as a descendant. An anonymous public-link request routed through the archiver service can produce a ZIP or TAR containing resources accessible to the link creator; normal WebDAV requests do not reach the bypass.

The record

CVE
CVE-2026-23989
Published
Feb 6, 2026
Updated
Feb 6, 2026
Vendor
OpenCloud
Product
REVA
Classifications
CWE-863, T1213
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.40.3
  2. Affected versionversion=>= 2.41.0, < 2.42.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenCloud · REVAversion=< 2.40.3; version=>= 2.41.0, < 2.42.3

Published CVSS scores

8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
8.2GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1213Data from Information Repositories

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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