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CriticalA PHP security release fixes two CVSS 9.2 flaws, and PHP 8.1 and older get no patchWhat it means for your site
CVE-2026-78071HighCVSS 7.5CVE published 28 August 2026Added to mySites.guru 28 August 2026

DPCalendar (com_dpcalendar) 7.0.0 to 8.19.5 (Joomla 3) - Authenticated Stored Cross-Site Scripting

DPCalendar renders a calendar location title into a data-title HTML attribute without escaping it, giving a stored cross-site scripting flaw. A payload such as x" onmouseover="alert(1) has no HTML tags, so it passes through the filterText input filter unchanged and breaks out of the attribute on output, where it becomes a live event handler. Storing the payload requires an account with DPCalendar location create permission (CVSS 4.0 vector PR:H), but the script then runs in the browser of every visitor who views that location page, so the permission bounds who can plant it and not who it hits. This was reported in two stages. Toan Le found the original as vendor issue 12203, fixed on 2026-08-27 in 8.19.5 and 10.12.0, which escaped nine of the ten data-title sinks in the component. mySites.guru proved the same day that the tenth was still open, at components/com_dpcalendar/site/tmpl/location/default_map.php line 23, reported it to Digital Peak and the Joomla Security Strike Team, and Digital Peak confirmed it on 2026-08-28. That last sink was closed on 2026-09-10 in 8.19.6 and 10.12.1, along with seven identical sinks in the free mod_dpcalendar_upcoming module templates (blog, default, horizontal, icon, panel, simple and timeline). CVE-2026-78071 was updated on 2026-09-10 to widen its affected range to 7.0.0-8.19.5 and 9.0.0-10.12.0 and to credit both finders. On Joomla 3 the fixed version is 8.19.6, which is a security-only release containing this one change. If you have overridden the DPCalendar location templates, the unescaped output is still in your override and updating the extension will not reach it.

Is my site affected?

CVE-2026-78071 is checked by 2 rules. Find the extension and release line your site runs:

ExtensionAffected versionsFixed inWhat to do
DPCalendarfrom 7.0.0 up to but not including 8.19.68.19.6Update DPCalendar to 8.19.6 or later.
DPCalendarfrom 9.0.0 up to but not including 10.12.110.12.1Update DPCalendar to 10.12.1 or later.
Check whether your sites are affected

How CVE-2026-78071 is scored

The base metrics as Joomla CNA published them, and what each one means for a site running an affected version. Threat and environmental metrics are left out: they describe a moment or a particular install rather than the flaw.

7.5 High

CVSS 4.0, scored by Joomla CNA
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/S:N/AU:N

How it is reached

AV:N Attack vector
Network. Reachable across the internet
AC:L Attack complexity
Low. Nothing to work around, it just works
AT:P Attack requirements
Present. Needs a particular deployment or race to line up
PR:H Privileges required
High. Needs an account with elevated rights
UI:N User interaction
None. Nobody has to be tricked into anything

What it does to the site

VC:H Confidentiality
High. Everything the site holds can be read
VI:H Integrity
High. Data and files can be altered at will
VA:L Availability
Low. The site slows or stutters

What it does beyond the site

SC:N Confidentiality
None. Other systems keep their data
SI:N Integrity
None. Other systems keep their integrity
SA:N Availability
None. Other systems stay up

Timeline

  1. 28 August 2026CVE-2026-78071 record published by its CNA
  2. 28 August 2026mySites.guru check added for DPCalendar (from 7.0.0 up to but not including 8.19.6)
  3. 28 August 2026mySites.guru check added for DPCalendar (from 9.0.0 up to but not including 10.12.1)
  4. 10 September 2026We published: Digital Peak patches four Joomla extensions after a Claude audit

Rule details

HighCVE-2026-780712026-08-28

DPCalendar - DPCalendar (com_dpcalendar) 9.0.0 to 10.12.0 (Joomla 4 to 6) - Authenticated Stored Cross-Site Scripting

DPCalendar renders a calendar location title into a data-title HTML attribute without escaping it, giving a stored cross-site scripting flaw. A payload such as x" onmouseover="alert(1) has no HTML tags, so it passes through the filterText input filter unchanged and breaks out of the attribute on output, where it becomes a live event handler. Storing the payload requires an account with DPCalendar location create permission (CVSS 4.0 vector PR:H), but the script then runs in the browser of every visitor who views that location page, so the permission bounds who can plant it and not who it hits. This was reported in two stages. Toan Le found the original as vendor issue 12203, fixed on 2026-08-27 in 8.19.5 and 10.12.0, which escaped nine of the ten data-title sinks in the component. mySites.guru proved the same day that the tenth was still open, at components/com_dpcalendar/site/tmpl/location/default_map.php line 23, reported it to Digital Peak and the Joomla Security Strike Team, and Digital Peak confirmed it on 2026-08-28. That last sink was closed on 2026-09-10 in 8.19.6 and 10.12.1, along with seven identical sinks in the free mod_dpcalendar_upcoming module templates (blog, default, horizontal, icon, panel, simple and timeline). CVE-2026-78071 was updated on 2026-09-10 to widen its affected range to 7.0.0-8.19.5 and 9.0.0-10.12.0 and to credit both finders. Update to 10.12.1 on Joomla 4, 5 and 6. The 9.x line has no patch of its own, so sites there need the staged upgrade across to 10.12.1 rather than a point update. If you have overridden the DPCalendar location templates, the unescaped output is still in your override and updating the extension will not reach it.

Affected versions: ≥ 9.0.0 and < 10.12.1

Full advisory: our disclosure post

Our disclosure post

Digital Peak patches four Joomla extensions after a Claude audit

Digital Peak patches four Joomla extensions after a Claude audit

Digital Peak shipped out-of-band fixes for DPCalendar, DPMedia, DPAttachments and DPCases on 10 September. DPAttachments is the one to do first.

Other vulnerabilities in DPCalendar

Updating for CVE-2026-78071 alone can leave a site on a release another rule still matches. These are the other flaws we check for in the same extension.

DPCalendar

Latest safe version: 10.12.1

References

CVE-2026-78071 questions

Which versions are affected by CVE-2026-78071?
CVE-2026-78071 is covered by 2 rules: DPCalendar from 7.0.0 up to but not including 8.19.6; DPCalendar from 9.0.0 up to but not including 10.12.1.
How do I fix CVE-2026-78071?
It depends on the extension and release line your site runs. For DPCalendar from 7.0.0 up to but not including 8.19.6: update DPCalendar to 8.19.6 or later. For DPCalendar from 9.0.0 up to but not including 10.12.1: update DPCalendar to 10.12.1 or later.
How severe is CVE-2026-78071?
Joomla CNA scores it 7.5 (High) under CVSS 4.0. In plain terms: reachable across the internet, needs an account with elevated rights and nobody has to be tricked into anything.

Running an affected version on a site you manage?

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This check is part of the mySites.guru Joomla vulnerability scanner, which reads every installed extension's version on each audit. Browse the rest of the Joomla vulnerability database.

Rules current as of 24 October 2026.