OpenEMR before 8.4.0 Cross-Patient Payment Tampering via Rainforest Portal Payments
Only affects OpenEMR before 8.4.0 when Rainforest is the configured payment gateway and patients pay through the portal. Fixed in 8.4.0.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- Fixed in 8.4.0
- Who is exposed
- Specific setups only
Do first: Check whether your setup matches what the bug needs. Rainforest is the configured payment gateway and the patient portal payment page is used with a patient-portal session OpenEMR versions before 8.4.0
- Last modified
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 15/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Specific setups only
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
OpenEMR before 8.4.0 contains an improper authorization vulnerability in Rainforest patient portal payments that trusts browser-supplied patientId, encounter, and amount values instead of deriving them from the portal session. Authenticated portal patients can tamper with JSON sent to portal_payment.rainforest.php so the payin.authorized webhook writes forged ar_activity credits to other patients' encounters exceeding the amount actually paid.
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure8/25Specific setups only, reachable over the network
- Reach?/20Unknown. No tracked technology or package matched
- Severity7.1/10CVSS 7.1
- No patch0/5No signal
What would change the score
- Would score about 65 if added to CISA KEV
- Would score about 60 if CISA's SSVC rates exploitation active
- Would score about 22 if CISA's SSVC rates it automatable
What to do
Check whether your setup matches what the bug needs.
Rainforest is the configured payment gateway and the patient portal payment page is used with a patient-portal session OpenEMR versions before 8.4.0Upgrade to a fixed version: 8.4.0.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- openemr openemr
fixed in 8.4.0
Evidence 2
- Advisory
- Link
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-124481
Is CVE-2026-124481 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: cve.now feed data
What does this mean?
A logged-in patient portal user can make a small Rainforest payment and have it recorded as a much larger credit against another patient's encounter. This falsifies receivables and patient balances.Source: github.com, vulncheck.com
Which versions are affected by CVE-2026-124481?
openemr: before 8.4.0.Source: cve.now feed data
Am I affected, and how do I check?
OpenEMR versions before 8.4.0 are affected when Rainforest is the configured payment gateway and the patient portal payment page is used with a patient-portal session. To check, look at the OpenEMR version and confirm whether Rainforest is set as the payment gateway.Source: github.com, vulncheck.com
How do I fix CVE-2026-124481?
Upgrade OpenEMR to 8.4.0 or later, which contains the fix.Source: github.com, vulncheck.com