# CVE-2018-25334: Bylancer Zechat CSRF in hashtag parameter

Source: https://junglewise.ai/threats/cve-2018-25334-bylancer-zechat-csrf-in-hashtag-parameter  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-17. Updated: 2026-05-17  
License: CC BY 4.0 with a link back

CVE-2018-25334 · Severity: medium · CVSS 5.4 · Published 2026-05-17

Zechat is a PHP-based chat application. A security flaw in version 1.5 allows an attacker to trick a logged-in user into unknowingly performing actions, such as changing their account profile information or email address. This could lead to unauthorized account modifications or potential account takeover if a user visits a malicious website while logged into the chat service.

Technologies: [Bylancer Zechat](https://junglewise.ai/threats/technologies/zechat). Vendors: [Bylancer](https://junglewise.ai/threats/vendors/bylancer).

## Quick answers

**Is CVE-2018-25334 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2018-25334 being exploited in the wild.

**How severe is CVE-2018-25334?** Medium severity, with a CVSS score of 5.4, published 17 May 2026.

**Which products and versions are affected?** Bylancer Zechat 1.5.

**Is there a fix for CVE-2018-25334?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2018-25334 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2018-25334?** Check whether you run Bylancer Zechat at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A Cross-Site Request Forgery (CSRF) vulnerability exists in Zechat 1.5 due to insufficient protection on sensitive user-data update endpoints. While the application implements a CSRF token mechanism, it is vulnerable to a bypass. An attacker can leverage a reflected XSS vulnerability in the 'hashtag' parameter or use a script to programmatically fetch the valid CSRF token from the settings page and then submit a forged POST request to /chat/data_settings.php. This allows an unauthenticated remote attacker to modify user profile details, including names and email addresses, provided they can trick an authenticated user into interacting with a malicious link or form. Proof-of-concept exploits also indicate related SQL injection vulnerabilities in the 'hashtag' and 'v' parameters.

## Affected products

- Bylancer Zechat 1.5

## Timeline

- 2018-05-22: disclosed: Original exploit and vulnerability details published on Exploit-DB
- 2026-05-17: advisory: CVE-2018-25334 published to NVD via VulnCheck enrichment

## References

- [https://bylancer.com/](https://bylancer.com/)
- [https://www.exploit-db.com/exploits/44685](https://www.exploit-db.com/exploits/44685)
- [https://www.vulncheck.com/advisories/zechat-cross-site-request-forgery-csrf-via-hashtag-parameter](https://www.vulncheck.com/advisories/zechat-cross-site-request-forgery-csrf-via-hashtag-parameter)

## Related threats

- [Bylancer Zechat SQL injection in profile.php](https://junglewise.ai/threats/cve-2018-25382-bylancer-zechat-sql-injection-in-profile-php)
- [Bylancer Zechat SQL injection in v parameter](https://junglewise.ai/threats/cve-2018-25339-bylancer-zechat-sql-injection-in-v-parameter)
- [Bylancer Zechat SQL injection in hashtag parameter](https://junglewise.ai/threats/cve-2018-25338-bylancer-zechat-sql-injection-in-hashtag-parameter)