TryGhost up to 6.61.x Checkout Flow cross site scripting

Summaryinfo

A vulnerability identified as problematic has been detected in TryGhost Ghost up to 6.61.x. The impacted element is an unknown function of the component Checkout Flow. Performing a manipulation results in cross site scripting. This vulnerability is reported as CVE-2026-103266. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in TryGhost Ghost up to 6.61.x. This affects some unknown functionality of the component Checkout Flow. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. The summary by CVE is:

Ghost versions 5.2.0 through versions prior to 6.62.0 allow a remote attacker, without authentication, to abuse the Stripe Checkout flow to attach a paid subscription to an existing member, modify that member's name, and inject content into newsletters sent to the member. Depending on the recipient's email client, the injected content may be rendered, resulting in HTML injection or cross-site scripting (XSS).

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-103266 since 09/30/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 6.62.0 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• TryGhost

Name

• Ghost

Version

• 6.0
• 6.1
• 6.2
• 6.3
• 6.4
• 6.5
• 6.6
• 6.7
• 6.8
• 6.9
• 6.10
• 6.11
• 6.12
• 6.13
• 6.14
• 6.15
• 6.16
• 6.17
• 6.18
• 6.19
• 6.20
• 6.21
• 6.22
• 6.23
• 6.24
• 6.25
• 6.26
• 6.27
• 6.28
• 6.29
• 6.30
• 6.31
• 6.32
• 6.33
• 6.34
• 6.35
• 6.36
• 6.37
• 6.38
• 6.39
• 6.40
• 6.41
• 6.42
• 6.43
• 6.44
• 6.45
• 6.46
• 6.47
• 6.48
• 6.49
• 6.50
• 6.51
• 6.52
• 6.53
• 6.54
• 6.55
• 6.56
• 6.57
• 6.58
• 6.59
• 6.60
• 6.61

Website

• Product: https://github.com/TryGhost/Ghost/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion