CVE-2021-36436: An issue in Mobicint Backend for Credit Unions v3 allows attackers to retrieve partial email addresses and use

This week

MEDIUM 5.3REMOTEDOWNGRADE

CVE-2021-36436 is a medium-severity flaw (CVSS 5.3) affecting mobicint. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue in Mobicint Backend for Credit Unions v3 allows attackers to retrieve partial email addresses and user entered information via submission to the forgotten-password endpoint.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-640
Published	2023-04-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mobicint

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-04-20 21:15 UTCPublished CVE record published
2026-06-17 03:58 UTCUpdated Record last modified

mobicint mobicint DOWNGRADE

Affected: 3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0

1. Check installed version

apt-cache policy mobicint || rpm -q mobicint || mobicint --version

2. No fixed release: DOWNGRADE to a release before 3.0 (Debian / Ubuntu)

apt-cache madison mobicint sudo apt install mobicint=<VERSION_BEFORE_3.0> sudo apt-mark hold mobicint

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mobicint sudo dnf downgrade mobicint-<VERSION_BEFORE_3.0> sudo dnf versionlock add mobicint

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-36436?

mobicint: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-36436 being exploited?

CVE-2021-36436 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-36436 affect?

CVE-2021-36436 affects mobicint. Severity is medium (CVSS 5.3). An issue in Mobicint Backend for Credit Unions v3 allows attackers to retrieve partial email addresses and user entered information via submission to the forgotten-password endpoint.

How urgent is CVE-2021-36436?

Priority 40/100. Public exploit reference; Remotely exploitable, no login, no user action

References

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