VulnerabilityPublished 19 Aug 2025

CVE-2025-9169: SolidInvoice · Cross-site Scripting

Affects SolidInvoiceSource CVE Database V5

Public exploit available · CVSS 5.1 Medium.

Data as of 26 Oct 2026, 10:12 UTC

CVSS 4.0 base score

5.1Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 23% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

Base metrics

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: Low
User Interaction: Passive
Vulnerable system confidentiality: None
Vulnerable system integrity: Low
Vulnerable system availability: None
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Threat metrics

Exploit Maturity: POC

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: Low: The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction: Passive: Successful exploitation of this vulnerability requires limited interaction by the targeted user with the vulnerable system and the attacker’s payload. These interactions would be considered involuntary and do not require that the user actively subvert protections built into the vulnerable system.
Vulnerable system confidentiality: None: There is no loss of confidentiality within the Vulnerable System.
Vulnerable system integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact to the Vulnerable System.
Vulnerable system availability: None: There is no impact to availability within the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.
Exploit Maturity: POC: Based on threat intelligence sources each of the following must apply: · Proof-of-concept is publicly available · No knowledge of reported attempts to exploit this vulnerability · No knowledge of publicly available solutions used to simplify attempts to exploit the vulnerability

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 19 Aug 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: evidence found.
CVSS exploit maturity: proof of concept public
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CVSS vector, the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
SolidInvoice	Affected 2.0 – 2.4.0 5 affected builds	Fixed in–

AI-suggested

Immediately restrict external access to the SolidInvoice /quotes endpoint by implementing network-level controls such as IP whitelisting or VPN access.
Employ web application firewalls (WAFs) with rules to detect and block common XSS payloads targeting the 'Name' parameter.
Sanitize and validate all user inputs on the server side, especially the 'Name' argument in the Quote Module, using strict allowlists or encoding outputs to prevent script injection.
Educate users about phishing risks and suspicious links to reduce the likelihood of successful user interaction exploitation.
Monitor logs for unusual requests or error patterns related to the /quotes endpoint.
If possible, upgrade to a version of SolidInvoice that addresses this vulnerability once released or consider applying community-developed patches.
Implement Content Security Policy (CSP) headers to reduce the impact of potential XSS attacks by restricting script execution sources.
Regularly review and update incident response plans to include scenarios involving web application vulnerabilities like XSS.

Description

A vulnerability was determined in SolidInvoice up to 2.4.0. Impacted is an unknown function of the file /quotes of the component Quote Module. This manipulation of the argument Name causes cross site scripting. Remote exploitation of the attack is possible. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.

Impact

For European organizations using SolidInvoice for invoicing and financial management, this XSS vulnerability poses a risk of session hijacking, unauthorized actions, and data exposure through client-side script execution. Given that invoicing systems handle sensitive financial data and client information, exploitation could lead to data breaches, fraud, or reputational damage. The remote nature of the vulnerability means attackers can target exposed SolidInvoice instances over the internet. The requirement for user interaction suggests phishing or social engineering could be used to deliver the exploit. Organizations in Europe with web-facing SolidInvoice deployments, especially those lacking robust input validation or web application firewalls, are at risk. Additionally, the lack of vendor response and patches increases the window of exposure. Compliance with GDPR also means that any data breach resulting from exploitation could lead to regulatory penalties.

Summary

CVE-2025-9169 is a cross-site scripting (XSS) vulnerability identified in SolidInvoice versions up to 2.4.0, specifically within the Quote Module's /quotes endpoint. The vulnerability arises from improper sanitization or validation of the 'Name' argument, allowing an attacker to inject malicious scripts. This flaw enables remote exploitation without requiring authentication, although user interaction is necessary for the malicious payload to execute (e.g., a victim clicking a crafted link). The vulnerability has a CVSS 4.0 base score of 5.1, indicating medium severity. The attack vector is network-based with low attack complexity and no privileges required, but user interaction is needed. The impact primarily affects the confidentiality and integrity of user sessions or data accessible via the web interface, potentially allowing attackers to steal session cookies, perform actions on behalf of users, or deface web content. The vendor has not responded to early disclosure attempts, and no patches or mitigations have been published yet. While no known exploits are currently active in the wild, the public disclosure increases the risk of exploitation by opportunistic attackers.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 27 Aug 2025, 01:17 UTC

Technical details

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