Pär Thernström Simple History Plugin up to 5.24.0 on WordPress insertion of sensitive information into sent data

Summaryinfo

A vulnerability classified as critical has been found in Pär Thernström Simple History Plugin up to 5.24.0 on WordPress. Affected is an unknown function. This manipulation causes insertion of sensitive information into sent data. This vulnerability is tracked as CVE-2026-39473. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Pär Thernström Simple History Plugin up to 5.24.0 on WordPress. It has been declared as critical. Affected by this vulnerability is some unknown processing. The manipulation with an unknown input leads to a insertion of sensitive information into sent data vulnerability. The CWE definition for the vulnerability is CWE-201. The code transmits data to another actor, but a portion of the data includes sensitive information that should not be accessible to that actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Insertion of Sensitive Information Into Sent Data vulnerability in Pär Thernström Simple History simple-history allows Retrieve Embedded Sensitive Data.This issue affects Simple History: from n/a through <= 5.24.0.

The weakness was disclosed by Timomangcut. It is possible to read the advisory at patchstack.com. This vulnerability is known as CVE-2026-39473 since 04/07/2026. The exploitation appears to be easy. The attack can be launched remotely. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/08/2026). The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• WordPress Plugin

Vendor

• Pär Thernström

Name

• Simple History Plugin

Version

• 5.0
• 5.1
• 5.2
• 5.3
• 5.4
• 5.5
• 5.6
• 5.7
• 5.8
• 5.9
• 5.10
• 5.11
• 5.12
• 5.13
• 5.14
• 5.15
• 5.16
• 5.17
• 5.18
• 5.19
• 5.20
• 5.21
• 5.22
• 5.23
• 5.24.0

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

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Exploitinginfo

Threat Intelligenceinfo

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Sourcesinfo

Entryinfo

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