CVE-2026-86113Public exploitNetwork attack vector

Authenticated reading-record tampering via missing ownership check

Published Sep 5, 2026 · Updated Sep 8, 2026

Authorization bypass in BookWyrm 0.9.1 and earlier allows remote authenticated users to overwrite other users' reading records. The edit_readthrough handler fetches a sequential ReadThrough ID, writes supplied dates and progress fields, and saves without checking record ownership. A valid account and CSRF token are required; successful requests corrupt reading history, statistics, goals, and exported data.

CVSS severity7.1
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in BookWyrm 0.9.1 and earlier allows remote authenticated users to overwrite other users' reading records. The edit_readthrough handler fetches a sequential ReadThrough ID, writes supplied dates and progress fields, and saves without checking record ownership. A valid account and CSRF token are required; successful requests corrupt reading history, statistics, goals, and exported data.

The record

CVE
CVE-2026-86113
Published
Sep 5, 2026
Updated
Sep 8, 2026
Vendor
BookWyrm
Product
BookWyrm
Classifications
CWE-639, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 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=0 <=0.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

BookWyrm · BookWyrmversion=0 <=0.9.1

Published CVSS scores

7.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
6.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1565.001Stored Data Manipulation

Public exploit references

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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